Combustion analysis of a 6.8253 g sample of an unknown organic compound produces 18.520 gof COzand 3.7905 gofH2O. The molar mass of the compound is 324.38 g/mol.Calculate the number of grams of C, H, and O in the original sample.

Answers

Answer 1
the original sample contained 0.3395 g of carbon, 0.0424 g of hydrogen, and 6.4434 g of oxygen.

Related Questions

Earth is the only planet in the Solar System with known, sustained life. Which of these things most likely enabled life on Earth to develop? (Choose 3) Select 3 correct answer(s) Question 4 options: Presence of liquid water Size of the Milky Way Galaxy Proximity of the Sun Composition of the atmosphere Oxygen-rich atmosphere

Answers

The three things that most likely enabled life on Earth to develop are the presence of liquid water, the composition of the atmosphere, and an oxygen-rich atmosphere, which are the first, fourth, and fifth options.

The development of life on Earth is believed to have occurred due to a combination of factors, including the presence of liquid water, the composition of the atmosphere, and the evolution of an oxygen-rich atmosphere. Water is essential for life as we know it. It provides a medium for biochemical reactions and is necessary for the functioning of many cellular processes. Earth's surface temperature and atmospheric pressure are such that water exists in its liquid state, which is ideal for life to thrive.

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H₂SO4what compound is this

Answers

Answer:

H₂SO₄ is sulfuric acid

Explanation:

H₂SO₄ is a chemical formula for sulfuric acid. It is a highly corrosive and dense liquid that is commonly used in many industrial processes, such as the production of fertilizers, dyes, detergents, and pharmaceuticals. Sulfuric acid is also used in car batteries and as a laboratory reagent.

List at least five terms from the introduction that you can use as key words in your search. edmentum science

Answers

Finding and examining search phrases that people enter through search engines for the purpose to utilise that information is the process of conducting keyword research.

The phrases and words that people employ when using search engines in order to locate what they're searching for are known as keywords. For instance, you may type "mens leather coat" into a search engine to get a new jacket. The phrase is still regarded as a keyword even though it has numerous words.

Keywords are concepts and themes that describe the subject matter of your article. They are the phrases and words that users type into search engines to find information, commonly referred to as "search queries" within SEO. If you scale down the size of all the content on your page, including the images, videos, prose, and so on.

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Answer:

idek

Explanation:

What is the numerical value of Kc
for the following reaction if the equilibrium mixture contains 0.032 M
N2O4 and 0.24 M NO2?

N2O4(g)⇌2NO2(g)

Answers

The expression for the equilibrium constant (Kc) for the given reaction is:

Kc = [NO2]^2 / [N2O4]

Where [NO2] and [N2O4] are the molar concentrations of NO2 and N2O4, respectively, at equilibrium.

Substituting the given equilibrium concentrations into the expression for Kc, we get:

Kc = (0.24 M)^2 / (0.032 M) = 1.8 M

Therefore, the numerical value of Kc for the given reaction, when the equilibrium mixture contains 0.032 M N2O4 and 0.24 M NO2, is 1.8 M.

2.5 mL of a 0.150 M solution is diluted with 2.5 mL of water. What is the concentration of the new solution?

Answers

The new concentration of the solution can be gotten as  0.075 M.

Dilution formula for solutions

The formula that we should use is;

C1V1 = C2V2

where:

C1 = initial concentration of the solution (in units of mass/volume, moles/liter, or other concentration units)

V1 = initial volume of the solution

C2 = final concentration of the solution after dilution

V2 = final volume of the solution after dilution

We have to note that;

C1V1= C2V2

Thus we have that;

2.5 * 0.150 = 5 * V

V = 0.075 M

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2. Balance the equation below for the reaction between acetylene and oxygen, using the smallest
whole-number coefficients.

C₂H₂(g) +
O₂(g) →→
_CO₂(g) +
H₂O(g) + heat

Answers

C₂H₂ + 5/2 O[tex]_2[/tex](g) → 2CO[tex]_2[/tex](g) +H [tex]_2[/tex]O(l) is the balanced equation for the given unbalanced chemical equation.

An equation per a chemical reaction is said to be balanced if both the reactants plus the products have the same number of atoms and total charge for each component of the reaction. In a nutshell, the two components of the reaction have an equal balance of mass and charge. preservation of charge and mass, equation and reaction balance, etc.

C₂H₂ +  O[tex]_2[/tex](g) → CO[tex]_2[/tex](g) +H [tex]_2[/tex]O(l)

Firstly balance the number of carbon atoms on product side by multiplying by 2

C₂H₂ +  O[tex]_2[/tex](g) → 2CO[tex]_2[/tex](g) +H [tex]_2[/tex]O(l)

Now balance hydrogen and oxygen

C₂H₂ + 5/2 O[tex]_2[/tex](g) → 2CO[tex]_2[/tex](g) +H [tex]_2[/tex]O(l)

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Why does intermolecular force exists between particles

Answers

Intermolecular forces exist between particles because all particles, whether they are atoms, molecules, or ions, have electric charges. These charges can create attractive or repulsive forces between particles, depending on their relative positions and charges. Intermolecular forces are responsible for many of the physical properties of matter, such as boiling point, melting point, viscosity, and surface tension. They play a crucial role in determining the behavior of liquids and solids, and they are essential to many chemical reactions and biological processes.

The symbol that indicates a substance dissolve in water is

Answers

The symbol that indicates a substance dissolve in water is (aq).

What is the symbol?

The word "(aq)" stands for aqueous and denotes a material that dissolves in water.

Aqueous solutions are created when substances dissolve in water and are uniformly dispersed throughout the liquid. "(aq)" is added to the end of a substance's chemical formula in a chemical equation to denote that the material is in an aqueous state.

We often see this in several chemical reactions and the symbols shows that the solute was dissolved in water.

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Please name this compound.

Answers

Answer:

3 methyl hexene

Explanation:

Name the property shown.

9. 2 x= x 2

td

11. 7(z+ y) = 7z+ 7y

10. 231= 23

12. a + (2b + 3c) = (a + 2b) + 3c

If 4.53g Ar are added to 1.12 atm He in a 2.00 L cylinder at 27.0 Celsius degree

What is the total of gaseous mixture?

Answers

The total gaseous mixture is 4.48 g.

The total gaseous mixture can be calculated using the ideal gas law: PV = nRT.

First, we need to convert the temperature to Kelvin: 27.0°C + 273.15 = 300.15 K.

Next, we can use the ideal gas law to calculate the number of moles of each gas:

For He: n = (1.12 atm) (2.00 L) / (0.08206 L·atm/mol·K) (300.15 K) = 0.0906 mol

For Ar: n = (4.53 g) / (39.95 g/mol) = 0.113 mol

The total number of moles of gas in the mixture is then:

n(total) = n(He) + n(Ar) = 0.0906 mol + 0.113 mol = 0.204 mol

Finally, we can calculate the total mass of the mixture:

m(total) = n(total) × M(avg)

where M(avg) is the average molar mass of the mixture, which can be calculated as:

M(avg) = (M(He) + M(Ar)) / 2 = (4.003 g/mol + 39.95 g/mol) / 2 = 21.98 g/mol

Thus,

m(total) = 0.204 mol × 21.98 g/mol = 4.48 g

Therefore, The total weight of the gaseous mixture is 4.48 g.

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What is the rate of the reaction in L/min

Answers

The rate of the reaction is obtained from the calculation as 0.022 L/min.

What is the rate of reaction?

We know that the rate of reaction has to do with the change in the volume or the concentration of one of the reactant which the volume of the oxygen have been chosen for the particular question that we are dealing with here.

Thus;

Rate of reaction = Change in the volume of oxygen/Time

= v2 - v1/t

= 0.35 L - 0.02 L/15 min

=0.022 L/min

Thus, we can see that the rate of the reaction can be obtained as 0.022 L/min.

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Which of the following is true

Answers

The only true option here is option (b) Decreasing the activation energy increases the reaction rate.

What is Activation Energy

Activation Energy is the energy required to initiate a chemical reaction. When the activation energy is lowered, it becomes easier for reactant molecules to overcome the energy barrier and react, leading to an increase in the reaction rate. Therefore, decreasing the activation energy increases the reaction rate.

If you recall the statement "The activation energy of an exothermic reaction is negative". This statement is not always true. The activation energy can be positive, negative, or zero, depending on the specific reaction.

There is another statement from the question which says, "There is no relationship between activation energy and reaction rate". This statement is entirely false.

Note that the activation energy plays a crucial role in determining the reaction rate.

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The student who represents Earth sees different stars from different positions in the circle. How does this model suggest evidence that Earth circles the sun once a year?

Answers

Earth orbits the sun in a predictable pattern. The pattern of Earth's seasons depend on how much sunlight reaches different areas of Earth as the planet moves around around the sun. It is the earth sun model which shows that the earth circles the sun once a year. So revolution is responsible for it.

Earth has a nearly circular orbit around the sun, Earth also rotates around its north-south axis, an imaginary line passing through earth from pole to pole. Every place on the planet gets 12 hours of light and 12 hours of dark each day.

The temperature conditions on the planet change depending on the distance from the sun. There are colder temperatures at the poles and warmer temperature at the equator.

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find the ΔG°rxn for a reaction that has a K = 17.23 at 371 K. Is the reaction spontaneous. Note: R = 8.314 J/mol.K

Answers

The value of ΔG°rxn is - 6979 J/mol, and the reaction is spontaneous.

The change in Gibbs free energy (ΔG°rxn) for a reaction can be calculated using the equation;

ΔG°rxn = -RT ln(K)

where; R = gas constant = 8.314 J/mol.K

T = temperature in Kelvin (K)

K = equilibrium constant for the reaction

Given;

K = 17.23

T = 371 K

R = 8.314 J/mol.K

Plugging in the given values into the equation;

ΔG°rxn = - (8.314 J/mol.K) × (371 K) * ln(17.23)

Using a calculator, we can calculate the natural logarithm of 17.23:

ln(17.23) ≈ 2.848

Plugging this value back into the equation;

ΔG°rxn = - (8.314 J/mol.K) × (371 K) × 2.848

ΔG°rxn ≈ - 6979 J/mol

The negative value of ΔG°rxn indicates that the reaction is spontaneous, as ΔG°rxn < 0.

Therefore, the reaction will occur spontaneously in the forward direction at 371 K when the equilibrium constant (K) is 17.23.

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one of the compounds left a white solid in the paper What is the name of thus compound?

Answers

One of the compounds left a white solid in the filter paper . Fat is the name of this compound.

Fat is typically defined as any ester of fatty acids, or a combination of such compounds, most frequently those that occur in living things or in food, in the fields of nutrition, biology, and chemistry. Triglycerides, or triple esters of glycerol, are the primary constituents of vegetable oils including fatty tissue in animals. The term is frequently used to refer particularly to triglycerides.

The word may additionally be employed more broadly to refer to any biologically relevant compound made of carbon, hydrogen, and oxygen that is soluble to non-polar solvents but insoluble in water. One of the compounds left a white solid in the filter paper . Fat is the name of this compound.

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Classify each element. Note that another term for main group is representative, another term for semimetal is metalloid, and the
inner transition metals are also called the lanthanide and actinide series.
Main-group metal
(representative metal)
Ru
Ta
Main-group nonmetal
(representative nonmetal)
As
Rn
Main-group
semimetal
(metalloid)
Answer Bank
In
Transition metal
Eu
Se
Inner transition metal.
(lanthanide/actinide)

Answers

Main-group metal (representative metal): Ru, Ta. Main-group nonmetal (representative nonmetal): As, Rn. Main-group semimetal (metalloid): In. Transition metal: Eu.  Inner transition metal (lanthanide/actinide): Se is not an inner transition metal. Therefore, the correct answer for Se should be replaced with an inner transition metal (lanthanide or actinide) .Possible replacements for Se: La (lanthanide), Am (actinide).

Main group elements can be further classified as metals, nonmetals, or metalloids (also known as semimetals) based on their physical and chemical properties. Metals are typically shiny, good conductors of heat and electricity, and malleable. Nonmetals are typically brittle, poor conductors of heat and electricity, and have low melting and boiling points. Metalloids have properties of both metals and nonmetals and are semiconductors.

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the process of dissolved solute particles being surrounded by water molecules in an aqueous solution is called

Answers

The process of dissolved solute particles being surrounded by the  water molecules in an aqueous solution is called solvation or hydration.

Solvation occurs when water molecules surround and interact with solute particles, usually ions or polar molecules, forming a stable solution. The water molecules surround the solute particles, with their polar ends facing the solute, creating a layer of water molecules around the solute particles, effectively dispersing and stabilizing them throughout the solution.

Solvation is a key process in many chemical and biological reactions that occur in aqueous solutions, as it helps to facilitate the dissolution of solutes and influences their properties and behavior in solution.

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--The given question is incomplete, the complete question is

"The process of dissolved solute particles being surrounded by water molecules in an aqueous solution is called ----------- ."--

Calculate the internal energy and enthalpy on heating of 100g of Na(s) from 60 C to 85 C. If the specific molar heat capacities at constant volume and pressure are 31.51J/Kmol and 28.20J/Kmol respectively.

Answers

To calculate the internal energy and enthalpy of heating of 100 g of Na(s) from 60°C to 85°C, we need to use the following equations:

ΔU = nCvΔT
ΔH = nCpΔT

where ΔU is the change in internal energy, ΔH is the change in enthalpy, n is the number of moles of Na(s), Cv is the specific molar heat capacity at constant volume, Cp is the specific molar heat capacity at constant pressure, and ΔT is the change in temperature.

First, we need to calculate the number of moles of Na(s):

n = m / M

where m is the mass of Na(s) and M is the molar mass of Na. The molar mass of Na is 22.99 g/mol:

n = 100 g / 22.99 g/mol = 4.35 mol

Next, we can calculate the change in internal energy:

ΔU = nCvΔT = 4.35 mol x 31.51 J/(mol K) x (85°C - 60°C) = 3,135 J

Finally, we can calculate the change in enthalpy:

ΔH = nCpΔT = 4.35 mol x 28.20 J/(mol K) x (85°C - 60°C) = 2,738 J

Therefore, the internal energy of heating of 100 g of Na(s) from 60°C to 85°C is 3,135 J and the enthalpy of heating is 2,738 J.

The rate of deforestation to create new buildings and farmland has increased over the last 100 years. What effect could this have on the atmosphere in the future?

Answers

The increase in deforestation can have a significant impact on the atmosphere in the future, mainly by reducing the number of trees that absorb carbon dioxide during photosynthesis.

Trees take in carbon dioxide and release oxygen as a byproduct, reducing the amount of carbon dioxide in the atmosphere. However, when trees are cut down, the carbon they have stored is released back into the atmosphere, contributing to increased levels of greenhouse gases.

The increase in greenhouse gases can lead to global warming and climate change, which can have a range of negative effects on the environment and human health, such as rising sea levels, increased frequency and severity of natural disasters, and more intense heat waves. Additionally, deforestation can lead to soil erosion, loss of biodiversity, and disruption of local ecosystems.

It is important to find ways to reduce deforestation and promote sustainable land use practices to mitigate the potential impacts on the atmosphere and the environment as a whole.

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The rate constant for the first-order reaction below is 0.0739 s-1
If the reaction is begun with an initial concentration of A equal to 0.95 M. what is the concentration of A after 38.02 s?
______M

Answers

The concentration of A after 38.02 s is 0.057 M.

What is the concentration of A after 38.02 s?

The concentration of A after 38.02 s is calculated by using rate equation as follows;

[A] = [A]₀e^(-kt)

where;

k is the rate constantA is the concentration of reactant AA₀ is the initial concentration of A at t=0t is the time elapsed since the reaction started

The concentration of A after 38.02 s is calculated as;

[A] = [A]₀e^(-kt)

   = 0.95 M e^(-0.0739 s⁻¹  x 38.02 s)

   = 0.057 M

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Tin hydroxide, Sn(OH)4, is an extremely insoluble substance. In an acidic buffer with a pH of 1.0, the solubility of Sn(OH)4 is 1.0 x 10^-7M. Calculate the Ksp for Sn(OH)4.

Answers

the Ksp for Sn(OH)₄ is 2.56 × 10⁻⁵

The solubility product constant is the equilibrium constant for the dissolution of a solid substance into an aqueous solution. It is denoted by the symbol Ksp.

The solubility product is a kind of equilibrium constant and its value depends on temperature. Ksp usually increases with an increase in temperature due to increased solubility.

Given,

Solubility of Sn(OH)₄ = 1 × 10⁻⁷

Sn(OH)₄ = Sn⁴⁺ + 4OH⁻

Ksp = s × (4s)⁴

= 256 s⁵

Ksp = 256 × 1 × 10⁻⁷

= 2.56 × 10⁻⁵

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What mass of oxalic acid is required to prepare 0.01 N solution in 5 liters?

Answers

Answer:

The mass of oxalic acid required to prepare 0.01 N solution in 5 L is 0.78 g.

Explanation:

Determine the density of a sample of ozone gas, O3 at 755 Torr and 18C.

Answers

The concept ideal gas equation is used here to determine the density of the ozone gas. The gas equation obtained by the combination of Boyle's law, Charles's law and Avogadro's law is known as the ideal gas equation.

Density is the measurement of how tightly a material is packed together. It is known as the mass per unit volume.

The ideal gas equation is:

PV = nRT

V = nRT / P

V = 1 × 0.0821 × 291 / 0.9966 = 23.97 L

755 Torr = 0.9966 atm

18°C = 291 K

Density = Mass / Volume

d = 48 / 23.97

d = 2.002 g/L

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Change element and compound names into chemical formulas for lithium hydroxide + hydrogen acetate-lithium acetate+water

Answers

The balanced reaction equation is;

LiOH + HC2H3O2 → LiC2H3O2 + H2O

What is reaction equation?

If we talk about a reaction equation, what we mean is the way that there can be a combination of the reactants and the products. We always show this by the use of an equation in which the reactants are on the left and the products are on the right side.

Now we have the word equation;

lithium hydroxide + hydrogen acetate-lithium acetate+water

The balanced reaction equation is shown above in the for the reaction that is thus stated.

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Calculate the percentage by mass of oxygen in copper (II) tetraoxosulphate (VI) (Cu = 64.0, S = 32.0, 0 = 16.0) ​

Answers

The percentage by mass of oxygen in CuSO4 is 40%.

What is the percentage by mass of an atom in a compound?

Finding the compound's molar mass is the first step in calculating the percentage of an atom by mass. The atomic masses of all the atoms in the compound are added up to determine the molar mass, which is the mass of one mole of the molecule.

We have the molar mass of the CuSO4 is given  as;

64 + 32 + 4(16) = 160 g/mol

Then we have the percentage by mass of oxygen as;

4(16)/160 * 100/1

40%

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b) 2.38 gm of a metal on treatment with nitric acid and sub sequent ignition gave 3.022 gm of the oxide. Specific heat of the metal is 0.055, calculate the extra atomic weight.

Answers

The extra atomic weight in a metal on treatment with nitric acid is 100.361 g/mol.

How to calculate extra weight?

The first step is to calculate the mass of oxygen in the oxide formed:

Mass of oxygen = Mass of oxide - Mass of metal

Mass of oxygen = 3.022 g - 2.38 g

Mass of oxygen = 0.642 g

Use the specific heat of the metal to determine its identity:

specific heat = 6.4 / atomic weight

Solving for atomic weight:

atomic weight = 6.4 / specific heat

atomic weight = 6.4 / 0.055

atomic weight = 116.36 g/mol

The atomic weight to calculate the extra atomic weight:

extra atomic weight = atomic weight - atomic weight of oxygen

extra atomic weight = 116.36 g/mol - 15.999 g/mol

extra atomic weight = 100.361 g/mol

Therefore, the extra atomic weight is 100.361 g/mol.

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Which phrase best defines eutrophication

Answers

Answer:

A treatment that reduces pollution - a lack of oxygen in a body of water

- an overgrowth of microorganisms

Explanation:

The process by which an aquatic body of water gets enriched with too many nutrients, mainly nitrogen and phosphorus, is known as eutrophication.

These nutrients encourage the excessive development of whom?

These nutrients encourage the excessive development of algae and other aquatic plants, which overpopulates the water with organic materials.

As a result, the water's oxygen content drops, which has a detrimental effect on the equilibrium of aquatic ecosystems.

Damage to aquatic animals, oxygen depletion, hazardous algal blooms, and water quality degradation can all result from eutrophication.

Although eutrophication is a long-term natural process, human activity may drastically speed it up. The main causes of eutrophication are excessive nutrient runoff from agriculture, poor waste management, and urban growth without adequate stormwater management.

Therefore, reducing the effects of eutrophication and maintaining the health of aquatic ecosystems depend on regulating nutrient inputs and implementing sustainable practises.

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so what would these items be ranked, from highest PH to lowest PH \\

milk
soda
baking soda
water vinegar
ammonia
glass cleaner

Answers

Answer:

From highest pH to lowest pH, the ranking of the items would be:

1. Ammonia (pH ~ 11-12)

2. Baking soda (pH ~ 8.3)

3. Glass cleaner (pH ~ 7-10)

4. Water vinegar (pH ~ 2.5-3.5)

5. Milk (pH ~ 6.5-6.7)

6. Soda (pH ~ 2.4)

Explanation:

what is the answer to this question and how do i figure it out?

Answers

The m/z that can be seen in propan - 1 ol but not propan - 2 ol is m/z = 15

What is the mass spectrum?

The distribution of ions produced by a sample in a mass spectrometer is depicted graphically as the mass spectrum.  A sample is ionized in a mass spectrometer, where the resultant ions are sorted according to their m/z ratio.

Each peak in the mass spectrum corresponds to a certain m/z ratio and represents one of the several ions that the sample produced. Thus the propan - 1 ol has the m/z = 15

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Why are zinc sulfate and copper sulfate solutions used for the battery? Why not just plain water?

Answers

Answer:

Combinations of certain metals, such as copper and zinc, will produce electrical activity when placed in special solutions called electrolytes. The two metals form the electrodes. The electrolyte creates a chemical action that causes the zinc to form positive ions and the copper to form negative ions.

Water can't be used due to copper sulfate being highly soluble in water.

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One member of this group is a semimetal. All of the other members of this group are metals, forming +3 cations. 1. Group 13 2. Group 14 3. Group 15 4. Group 16 Anemia, thrombocytopenia and acute renal failure are the classic findings of acute hemolytic-uremic syndrome (HUS).TrueFalse Kit and Min form the KM Partnership, with each receiving a 50% interest in the capital and profits of the partnership. Kit contributes land with a basis of $30,000 (fair market value of $50,000) and cash of $20,000 for a 50% interest in the partnership. Min contributes services worth $70,000 to the partnership. Respond to the following questions: a. What is Kits realized gain b. What is Kits recognized gain according to IRC 721 c. What is Kits basis in KM Partnership d. What is the KM Partnership basis in the Land it received An arterial catheterization is performed by cutdown for transfusion. What CPT code is reported?A) 36620B) 36625C) 36640D) 36600 Following the Emancipation Proclamation, which of the following constitutional amendments formally ended slavery?A.the First AmendmentB.the Fifth AmendmentC.the Eighth AmendmentD.the Thirteenth Amendment When oligopolistic firms in an industry form a cartel, then it is most likely that___A. both industry output and prices will increase. B. industry output will decrease while prices will increase. C. both industry output and prices will decrease. D. industry output will increase while prices will decrease. Paragraphs 14-16Write: what does this section reveal about roli and mercys relationship? PLEASE IS MATH 8th GRADE IS FOR TODAY Question 6 If a $10,000 investment earns a 7% annual return, what should its value be after 6 O $15,000 O $10,700 0 $10,000 O $15.100 O $15.010 Measuring BAC (Blood Alcohol Concentration) is done by measuring a person's: Let ()=225+5f(x)=2x 2 5x+5 and ()=2+4g(x)=x 2 +4. Find the following.a) (+)()(f+g)(x)(+)()=(f+g)(x)=Previewb) ()()(fg)(x)()()=(fg)(x)=Previewc) ()()(fg)(x) The 500 values of x, y, z1, and z2 in ivreg2.dat were generated artificially. The variable y = B1 + B2x+e= 3 + 1xx+e. (a) The explanatory variable x follows a normal distribution with mean zero and variance o 2. The random error e is normally distributed with mean zero and variance o 1. The covariance between x and e is 0.9. Using the algebraic definition of correlation, determine the correlation between x and e. (b) Given the values of y and x, and the values of i 3 and B2 = 1, solve for the values of the random disturbances e. Find the sample correlation between x and e and compare it to your answer in (a). - - e. (c) In the same graph, plot the value of y against x, and the regression function E(y) = 3 + 1 x x. Note that the data do not fall randomly about the regression function. (d) Estimate the regression model y = Bi + B2x +e by least squares using a sample consisting of the first N = 10 observations on y and x. Repeat using N = 20, N = 100, and N = 500. What do you observe about the least squares estimates? Are they getting closer to the true values as the sample size increases, or not? If not, why not? (e) The variables zi and z2 were constructed to have normal distributions with means zero and variances one, and to be correlated with x but uncorrelated with e. Using the full set of 500 observations, find the sample correlations between zi, 72, X, and e. Will z and z2 make good instrumental variables? Why? Is one better than the other? Why? (f) Estimate the model y = B1 + B2x +e by instrumental variables using a sample consisting of the first N=10 observations and the instrument zi. Repeat using N=20, N=100, and N = 500. What do you observe about the IVestimates? Are they getting closer to the true values as the sample size increases, or not? If not, why not? (g) Estimate the model y = B1 + B2x +e by instrumental variables using a sample consisting of the first N=10 observations and the instrument z2. Repeat using N=20, N=100, and N=500. What do you observe about the IVestimates? Are they getting closer to the true values as the sample size increases, or not? If not, why not? Comparing the results using z1 alone to those using z2 alone, which instrument leads to more precise estimation? Why is this so? (h) Estimate the model y=B1 + B2x +e by instrumental variables using a sample consisting of the first N=10 observations and the instruments z; and z2. Repeat using N=20, N=100, and N=500. What do you observe about the IV estimates? Are they getting closer to the true values as the sample size increases, or not? If not, why not? Is estimation more precise using two instruments than one, as in parts (f) and (g)? Susan wants to make aprons for cooking. She needs 1 1/2 yards of fabric for the front of the apron and 1/8 yards of fabric for the tie.Part A: Calculate how much fabric is needed to make 3 aprons? Show every step of your work. (5 points)Part B: If Susan originally has 7 yards of fabric, how much is left over after making the aprons? Show every step of your work. (5 points)Part C: Does Susan have enough fabric left to make another apron? Explain why or why not. (2 points) please help Wings of birds and butterflies have similar functions, but different evolutionary origins. They are...a) physiological structures.b) phylogenetic structures.c) homologous structures.d) analogous structures. 4 identical glasses and 4 identical jugs hold a total of 11.12 of water.Each glass holds 0.33 of water.How much water does each jug hold ? the coordinate plane, we can calculate the slope of the line through these points using the following formula. Slope = y x = b2 b1 a2 a1 Find the point where the line through (5, 2) with slope 4 crosses the vertical axis. (x, y) = ANSWER FOR BRAINLIST AND HEARTS DUE TODAY Solve m^2 6m = 3. Use the Quadratic Formula. Leave your answers as simplified radicals.Show ALL your work. solve for x by using the quadratic formula 20x^2-33x+10=0 Answer Immediately Please Determine the value of each fruit. Watch the operation signs in the last equation.