How many moles are in 53.99 mg chromium?

Answer: 2607.31 pa

Explanation:

n = 10.1/2 = 5.05 mol

Now, according to ideal gas equation,

PV = nRT

⇒ P × 5 = 5.05 × 8.314 × (37.5 +273)

⇒P = 2607.31 Pa

Combination (also called synthesis): Where two elements or one compound and one element will bond and form a new compound as a product, the representation for this reaction is:

A + B -> AB

The only option that follows this description of Combination reaction is the first reaction:

N2 + O2 -> 2 NO

1) List the known and unknown quantities.

Amount of substance: moles

mass: grams

2) Set the equation.

If we have the number of moles of a compound, we have to multiply it by the molar mass to find the mass.

Answer: multiply moles by the molar mass.

.

Answer: the second one

Explanation:

Answer:

there's no answer choices?

ANSWER

The chemical formula of Hydroiodic acid is HI

EXPLANATION

Hydroiodic acid is formed from a reaction between hydrogen and iodine resulting into an aqueous solution of Hydrogen iodide

Hence, the chemical formula of Hydroiodic acid is HI

The north star are stationary because it is positioned close to earth axis.it is the brightest star in the constellation.  

Star is a luminous celestial body of gas which are mostly hydrogen and helium that shines and radiate energy sources. north star named as north star because its location is exactly above north pole. north star having some spiritual meaning , it is also called as polaris. north star is in the same location every night unlike all the other star.  it is the brightest star in the constellation.

Thus, The north star are stationary because it is positioned close to earth axis.it is the brightest star in the constellation.

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1) Write the proper formula for Mg2+ and Br-

Balance the charges.

Mg2+: Multiply by 1. This gives a total of two positive charges.

Br-: Multiply by 2. This gives a total of two negative charges.

Use multipliers as subscripts

2) Write the proper formula for Al3+ and O2-

Al3+: Multiply by 2. This gives a total of six positive charges.

O2-: Multiply by 3. This gives a total of six negative charges.

Use multipliers as subscripts

The normal range of creatinine in human blood is between 0.50 mg/dL and 1.1 mg/dL. The patient's blood has a concentration of 0.0082 g/L. Let's convert that value into mg/dL.

We kwnot that there are 1000 mg in 1 g. And there are 10 dL in 1 L. We have to use those conversions.

1000 mg = 1 g 10 dL = 1 L

0.0082 g/L = 0.0082 g/L * 1000 mg/g = 8.2 mg/L * 1 L/ (10 dL) = 0.82 mg/dL

0.0082 g/L = 0.82 mg/dL

0.50 mg/dL < 0.82 mg/dL < 1.1 mg/dL

Answer: The concentration of creatinine = 0.82 mg/dL. It is in the normal range.

Answer:

There would be a change in the color of the potassium iodide from yellowish-brown to colorless

Explanation:

Here, we want to test for the presence of oxidizing agent by the use of potassium iodide

Since we already have the inference, we need to state what would be observed

Potassium iodide itself is a reducing agent

Thus, it becomes oxidized

In the process of being oxidized, there would be a color change

The color change observed will be from yellowish-brown to colorless

In this question, we have the following reaction:

C2H6 -> C2H4 + H2

As we can see, we had two hydrogen atoms being decomposed from the original molecule, therefore we had 2 bonds being broken, and bond breaking is an endothermic process, because it requires energy in order to occur, therefore we have as the best answer, letter D, or 4th option

The molality of the dimethyl ether in the solution is 15.8m

What is molarity ?

Molality (m), or molal concentration, is the amount of a substance dissolved in a certain mass of solvent. It is defined as the moles of a solute per kilograms of a solvent.

Moles of dimethyl ether= 80.1/46.07 = 1.74 moles

Molarity = moles of solute/ mass of solvent * 1000

                1.74/110*1000 = 15.8m

The molality of the dimethyl ether in the solution is 15.8m

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The following is NOT a characteristics of an acid is has high pH

An acid is the substances in water solution taste sour changes blue litmus paper to red react with some metal to liberate hydrogen and also react with base to form salt and promote chemical reaction and here in the given option the incorrect is high pH because acid has low pH and pH is less than 7 is acidity and more than 7 is basicity and pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water and water that has more free hydrogen ions is acidic whereas water that has more free hydroxyl ions is basic

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A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

given that :

weight of gold , m= 10.7 g

temperature, T = 19.8 °C

weight of iron , m = 18.7 g

temperature, T = 53.3 °C

final temperature t = ?

specific heat for gold , c = 0.12 J/ g °C

specific heat for iron , c =  0.45 J/ g °C

now, using the specific heat formula we get :

( mc ΔT ) + ( mc ΔT ) = 0

( 10.7 × 0.12 ×( t - 19.8 )  +  ( 18.7 × 0.45 × (t - 53.3 ) = 0

(1.28 t - 25.4) + ( 8.41 t - 448.2 ) = 0

9.69 t = 473.6

t = 48.87 °C

Thus, A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

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Answer: 4

Explanation:

Answer:

A. There is an overall energy increase when bonds form.

Explanation:

Remember that when a chemical reaction occurs, molecular bonds are broken and other bonds are formed to make different molecules. For example, the bonds of two water molecules are broken to form hydrogen and oxygen. Energy is always required to break a bond, which is known as bond energy but we release energy when we form a bond.

Many atoms are unstable because they have to comply with the octet rule, so they form bonds with other atoms and the energy is released. So based on this logic, the answer would be A. There is an overall energy increase when bonds form.

We must first check the valence number of the sulfur in the sulfate ion. In this ion, the valence number is +6 and we have 4 bonded oxygens.

The Lewis structure of the sulfate ion is as follows:

We have six bonding in the molecule. So the answer will be B. six bonding and no lone pairs of electrons.

Answer:

b. Double displacement.

Explanation:

It is a double displacement reaction, because in this case, hydrogen atom in HBr is replaced by a sodium atom (from NaOH), and the sodium atom (in NaOH) is replaced by another H atom from HBr molecule, to form H2O.

Answer

A. catalyst

Explanation

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed.

After one of the reactants has been totally consumed, the moles of HCl that have been produced is 20 moles.

The mole ratio of the reactants in the reaction is given below:

Equation of the reaction:

C₃H₈ + 4 Cl₂ --> C₃H₄Cl₄ + 4 HCl

The mole ratio of C₃H₈ and Cl₂  is 1 : 4

The mole ratio of the reactants, C₃H₈ and Cl₂  present is 6 : 20

mole ratio of the reactants, C₃H₈ and Cl₂  present is 3 : 10

Hence the limiting reactant is  Cl₂

Moles of HCl to  Cl₂  is 1  : 1.

Hence, the moles of HCl produced will be 20 moles

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NaOH

M = molarity (mol/L)

12.0 ml = 0.012 L

Answer: moles of NaOH = 1.32x10^-3 moles

Answer

B - They increase the H+ concentration in solution.

Explanation

All acids contain H+ for example, HCl contributes H+ ions into the solution, which decreases the pH of the solution. for example, a base, NaOH increases the concentration of OH⁻ ions and decreases the concentration of H⁺ ions. Therefore all acids increase the H+ concentration in solution.

The final pressure when the sample of gas is administered to the new volume and temperature is 0.64 atm.

Combined gas law put together both Boyle's Law, Charles's Law, and Gay-Lussac's Law. It states that "the ratio of the product of volume and pressure and the absolute temperature of a gas is equal to a constant.

It is expressed as;

P₁V₁/T₁ = P₂V₂/T₂

Given the data in the question;

To determine the final pressure of the gas, plug the given values into the formula above and solve for P₂.

P₁V₁/T₁ = P₂V₂/T₂

P₁V₁T₂ = P₂V₂T₁

P₂ = P₁V₁T₂ / V₂T₁

P₂ = ( 1.20 atm × 6.02L × 293.35K ) / ( 10.0L × 332.65K )

P₂ = ( 2119.1604 KLatm ) / ( 3326.5 KL )

P₂ = 0.64 atm

Therefore, the final pressure of the gas is 0.64 atm.

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The question requires us to calculate the mass of reactant (O2) necessary to obtain 15 L of the product (NO2) under the conditions given.

The following information was provided by the question:

- Balanced chemical reaction: 2 NO(g) + O2(g) → 2 NO2(g)

- Final volume of NO2: 15 L

- Pressure: P = 752 mmHg

- Temperature: 344 K

- Gas constant: R = 0.08206 L⋅atm/mol⋅K

To solve this question, we'll need to go through the following steps:

1) calculate the number of moles that corresponds to 15 L of NO2, considering the temperature and pressure given;

2) use the stoichiometric relation to calculate the necessary amount of O2 to produce the previously calculated number of moles of NO2

3) use the molar mass of O2 and the value calculated on step 2 to obtain the necessary mass of O2

Next, we'll solve the problem following these steps:

1) To calculate the number of moles of NO2, we'll use the following equation:

where P is the pressure, V is the volume of gas, n is the number of moles, R is the constant of gases and T is the temperature.

If we rearrange the equation to calculate the number of moles, we'll have:

Note that the problem provided all necessary information for this calculation, but the pressure given (752 mmHg) needs to be converted into atm to match the constant provided.

To do that, we'll use the following:

1 atm = 760 mmHg

Thus, we need to divide the value provided by 760:

Now, we can apply the values of pressure, volume and temperature, as well as the constant provided, to the equation written above:

So far, we have that the volume of NO2 to be produced (15 L) corresponds to 0.525 mol under the conditions of pressure and temperature provided.

2) Next, we use the chemical reaction to calculate the number of moles of O2 required to produce 0.525 mol of NO2.

From the reaction, we have that 1 mol of O2 leads to 2 mol of NO2. Then, we use this to calculate how many moles of O2 would produce 0.525 moles of NO2:

1 mol O2 --------------- 2 mol NO2

x -------------------------- 0.525 mol NO2

Solving for x, we have:

Now, we know that 0.263 moles of O2 are necessary to produce 15 L of NO2

3) The last step is calculate the mass of O2 that corresponds to 0.263 moles of this compound.

To do this, we need the molar mass of O2. Since the atomic mass of oxygen is 15.99 u, the molar mass of O2 is:

molar mass O2 = (2 * 15.99) = 31.98 g/mol

With this information, we can calculate the mass of 0.263 moles of O2:

1 mol O2 -------------------- 31.98 g O2

0.263 mol O2 ------------ y

Solving for y, we have:

Therefore, the mass of O2 necessary to produce 15 L of NO2 under the conditions given is 8.41 g.

Explanation:

The theoretical yield of our reaction is 1.50 moles, the actual yield of aluminum oxide is 0.885 moles. The percent yield is:

percent yield = actual yield/theoretical yield * 100 %

percent yield = 0.885 moles/(1.50 moles) * 100 %

percent yield = 59.0 %

Answer: The percent yield is 59.0 %.

Answer:

bond to form a covalent bond

Explanation:

a covalent bond is formed when two atoms share electron pairs.

The quantum numbers for the next electron added to this atom are  n = 2, ℓ = 0, mℓ = 0, ms = -½

The set of numbers used to explain the placement and strength of the electron in an atom are called quantum numbers. There are 4 quantum numbers, particularly, main, azimuthal, magnetic, and spin quantum numbers. The values of the conserved portions of a quantum gadget are given by quantum numbers.

The price of n tiers from 1 to the shell of the outermost electron of that atom. The important quantum variety may be determined by way of searching the period (numbered row) of the element on the periodic table. The principal quantum numbers of electrons inside the S-block and P-block are similar to the period range.

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According to the concept of molar concentration,0.715 g of hydrogen iodide are dissolved in the solution.

Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.

The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.

In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.

Using the formula of M₁V₁=M₂V₂ molarity of HI is determined,that is ,M₂=0.25×22.4/15=0.373 M.

For determining the mass is determined by using the formula,mass=0.373×127.911×0.015=0.715 g

Thus, 0.715 g of hydrogen iodide are required for making the solution.

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Answer: For example, Christmas lights transform electrical energy into thermal energy and light energy.

Explanation: so it either thermal or light, most likely light.

Answer:

D) Nondisjunction

Explanation:

Nondisjunction happens when a chromosome pair doesn't separate during meiosis. A result is one of the gamates has to any chromosome, while others have much less.