Explanation:
C₂H₄ + 3 O₂ ——> 2 CO₂ + H₂O
According to the coefficients of the equation 1 mol of C₂H₄ will react with 3 moles of O₂. Then, the molar ratio between C₂H₄ and O₂ is 1 to 3. We can use that relationship to find the number of moles of oxygen that are needed to react with 5.75 moles of C₂H₄.
1 mol of C₂H₄ = 3 moles of O₂
moles of O₂ = 5.75 moles of C₂H₄ * 3 moles of O₂/(1 mol of C₂H₄)
moles of O₂ = 17.25 moles
One mol of a gas at STP always occupies 22.4 L. We can use that relationship to find the volume of oxygen.
1 mol of O₂ = 22.4 L
volume = 17.25 moles of O₂ * 22.4 L/(1 mol of O₂)
volume = 386.4 L
Answer: 386.4 L at STP is needed to react.
In the following reaction, What quantity in moles of CH₃OH are required to give off 1501 kJ of heat? 2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g) ∆H° = -1280. kJ
Taking into account the definition of enthalpy of a chemical reaction, 2.345 moles of CH₃OH are required to give off 1501 kJ of heat
Definition of enthalpy of a chemical reactionThe enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when chemicals are transformed into a chemical reaction at constant pressure.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Amount of moles of CH₃OHIn this case, the balanced reaction is:
2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g)
and the enthalpy reaction ∆H° has a value of -1280 kJ/mol.
This equation indicates that when 2 moles of CH₃OH reacts with 3 moles of O₂, 1280 kJ of heat is released.
If it is required to give off 1501 kJ of heat, you can apply the following rule of three: If 1280 kJ of heat is released by 2 moles of CH₃OH, 1501 kJ of heat is released by how many moles of CH₃OH?
amount of moles= (1501 kJ× 2 moles of CH₃OH)÷ 1280 kJ
amount of moles= 2.345 moles of CH₃OH
In summary, the amount of moles required are 2.345 moles.
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F-F covalent bond is slightly polarTrue or false and why?
Answer:
False. F-F would be a covalent apolar molecule.
Explanation:
As we have two elements bonded of the same element, in this case, F (fluorine), they would be sharing electrons, making that the bonding is covalent but there are no charges, because they're the same element, so it would be a completely covalent apolar molecule.
How many protons and neutrons are in an atom of Pm-147 ?
Promethium is the 61st element that you can find in the periodic table and the number 147 indicates the atomic mass.
Remember that the atomic number (in this case, 61) represents the number of protons, so there are 61 protons in Pm-147.
And to find the number of neutrons, we have to subtract the atomic number (61) from the atomic mass (147):
[tex]\#\text{ neutrons = 147-61 = 86.}[/tex]So, the final answer is that we have 61 protons and 86 neutrons of Pm-147.
WILL MARK BRAINLIEST! THIS IS DUE TODAY
1) Isotopes of certain____ elements that spontaneously emit ____ and ____ from the ___.
2) In a nuclear fusion reaction, two small, light ____(hydrogen atoms) combine under extreme ____ and pressure to form one larger, heavier nucleus (helium).
1)Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.
2)In a nuclear fusion reaction, two small, light 'nuclei' (hydrogen atoms) combine under extreme 'temperature' and pressure to form one larger, heavier nucleus (helium).
What are nuclear fusion ?The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in such a fusion reaction. So because mass of the emerging single nucleus is smaller than that of the combined mass of the two initial nuclei, the process generates electricity. Remaining mass is converted to energy.
Why nuclear fusion is not possible?Normal electrostatic forces between positively charged nuclei prohibit them from coming close enough to smash and allow fusion to occur, hence fusion is not feasible.
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What are some assumptions and observations of this map, relating to the use of relations and polynomials?
ANSWER
STEP-BY-STEP EXPLANATION
How many liters of oxygen gas are required to burn 6.82 L of acetylene (C2H2) at STP?
17.05 L of O₂ are needed to react with 6.82 L of acetylene gas C₂H₂ at STP.
The reaction to the given question is :
2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O
From the equation we see
2 moles of C₂H₂ react with 5 moles of O₂
According to the equation,
2 liters of Acetylene reacts with = 5 liters of O₂
So,
6.82 L Acetylene will produce = X L of O₂
Solving for X,
X = ( 6.82 L × 5 L ) ÷ 2 L
X = 17.05 L of O₂
Thus, 17.05 L of O₂ is needed to react with 6.82 L of acetylene gas C₂H₂.
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Which of the following is a combination reaction?A) C) N2 (g) + 02 (g) → 2NO (g)-BB) KOH (aq) + HNO3 (aq) → HN20 (/) + KNO3 (aq)CA) CaCl2 (aq) + Na2SO4 (aq) → CaSO4 (s) + 2NaCl (aq)DD) AgNO3 (aq) + NaCl (aq) - AgCl (s) + NaNO3 (aq)
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
What kind of energy transfer happens when you hang Christmas lights?
Answer: For example, Christmas lights transform electrical energy into thermal energy and light energy.
Explanation: so it either thermal or light, most likely light.
Which is a common use for a type of electromagnetic radiation?
A tanning bed uses microwaves.
Water purification uses radio waves.
Thermal imaging uses infrared waves.
Weather radar uses ultraviolet waves.
Common use for a type of electromagnetic radiation is Thermal imaging uses infrared waves.
When magnetic field comes in contact with electric field than electromagnetic radiations are formed. The magnetic field and the electric field are perpendicular to each other. types of electromagnetic waves are : Radio waves, Microwaves, Infrared waves, Visible light , Ultraviolet waves, X- rays , gamma rays.
A tanning bed uses the ultraviolet waves
water purification uses the UV waves
Thermal imaging uses the infrared waves
weather radar use the Radio waves
Thus, Common use for a type of electromagnetic radiation is the Thermal imaging uses infrared waves.
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NEVERMINDDDDDDDDDDDDDDD
Answer:
what is this free
branliest?
Help don’t understand this
The chemical equation will be written as:
2C2H6 + 7O2 → 6H2O + 4CO2
What is ac Chemical Equation?Chemical formulas and symbols are used in chemical equations to depict a chemical reaction symbolically. A plus sign is placed between each entity in the reactants and products, and an arrow pointing in the direction of the products indicates the direction in which the reaction is taking place. The reactant entities are listed on the left and the product entities on the right. Chemical equations can be interspersed with structural (pictorial diagrams), symbolic, or both types of formulations. The absolute values of the stoichiometric numbers are represented by the coefficients placed next to the symbols and formulas of the entities.An arrow symbol, a series of reactants (the chemicals used to initiate the chemical reaction), and a list of products (the substances created during the chemical reaction) make up a chemical equation. Each substance is described by its chemical formula, which is sometimes followed by a figure known as the stoichiometric coefficient.Therefore,
The chemical equation will be written as:
2C2H6 + 7O2 → 6H2O + 4CO2
The Law of Conservation of Mass provides the foundation for balancing chemical equations. Stoichiometric coefficients must be added to products and reactants in order to balance the chemical equations. This is essential because all chemical equations must adhere to the laws of constant proportions and mass conservation, which dictate that the product side and reactant side of the equation must have the same number of atoms of each element.To learn more about Chemical Equations, refer to:
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Now that we have put a coefficient of 2 in front of Na3PO4 , what coefficient should go in front of NaCl to balance sodium ( Na )? 2Na3PO4+MgCl2→Mg3(PO4)2+?NaCl Express your answer numerically as an integer.
A coefficient of 2 has been put in front of Na₃PO₄, so to balance Na coefficient in front of NaCl will be 6.
The balanced equation of the reaction is -
2 Na₃PO₄ + 3 MgCl₂ → Mg₃(PO₄)₂ + 6 NaCl
This is a complete balance chemical equation of the given reaction with coefficient 6 in front of NaCl to balance Na.
Here,
We've been given a chemical equation which is unbalanced. A coefficient of 2 has been put in front of Na₃PO₄ and we are asked about what coefficient should go in front of NaCl so that the sodium Na is balanced. Since, there were total 3 Na before the coefficient was placed, but after putting the coefficient of 2, Na is 2 x 3, which is 6.
Therefore, an integer 6 is to be put in front of NaCl to balance Na in the equation.
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Choose the effect of acid you think is most important, and justify your choice.
The effect of acid you think is most important because chemical that can donate a hydrogen ion to other molecule
Acid is an that in water solution taste sour and changes blue litmus to red and react to some metal to liberate hydrogen react with bases to form salt and and also promote chemical reaction and the effect of acid is the chemical that can donate hydrogen ion to other molecule and the result in other molecule changing shape and possibly breaking apart
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A salt solution has a molarity of 1.5 M. How many mole of this salt are present in 2.0 L of this solution.A. 1.5 molesB. 2.0 molesC. 3.0 moles D. 0.75 mole
Answer:
[tex]C\text{ : 3.0 moles}[/tex]Explanation:
Here, we want to get the number of moles present in the solution
Mathematically:
[tex]Number\text{ of moles = molarity }\times\text{ volume in L}[/tex]From the question:
We have the molarity as 1.5 M
We have the volume as 2.0 L
Thus, we have the number of moles as:
[tex]1.5\text{ }\times\text{ 2 = 3.0 moles}[/tex]During a day that is 39°F outside, it is also mid-fall. There is a nearby pond, what assumptions can you make about the temperature within that pond on that day?
The temperature should be between 30 °F and 60 °F because the temperature outside is 39 °F, so the water in the pond should have a temperature range that includes this temperature.
Therefore, the answer is B.
30.The type of chemical reaction represented by the following equation is....HBr + NaOH ---> H2O + NaBrSelect one:a. decomposition. b. double displacement.c. single displacement.d. synthesis.
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.
A given sample of gas is held in a container with the volume of 6.02 L with a temperature of 59.5℃ at a pressure of 1.20 atm. What is the final pressure
The final pressure of a sample of gas held in a container with a volume of 6.02 L and a temperature of 59.5℃ is 0.26atm.
How to calculate pressure?The pressure of a given gas can be calculated using Boyle's law equation as follows:
P₁V₁ = P₂V₂
Where;
P₁ = initial pressureV₁ = initial volumeP₂ = final pressureV₂ = final volumeT₁ = initial temperatureT₂ = final temperatureAccording to this question, a given sample of gas is held in a container with the volume of 6.02 L with a temperature of 59.5℃ at a pressure of 1.20 atm. The final pressure can be calculated as follows;
At STP;
V = 22.4LT = 273K1.2 × 6.02/332.5 = P × 22.4/273
0.0217 = 0.082P
P = 0.26atm
Therefore, 0.26atm is the final pressure of the gas.
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100 points!
Why rusting is a chemical change?
1-A new reactant is formed
2-A new product is formed
3-There is increased activation energy
4-A new substance is not formed
Answer: 4
Explanation:
A 51.72 g sample of a substance is initially at 23.5 °C. After absorbing 2547 J of heat, the temperature of the substance is 123.4 °C. What is the specific heat ( ) of the substance?
The heat absorbed or released by a substance is given by the following formula:
[tex]Q=m\cdot Cp\cdot(T2-T1)[/tex]Where Q is the heat absorbed or released, m is the mass of the substance, Cp is the specific heat, T2 is the final temperature and T1 is the initial one.
We know the values of Q, m, T2 and T1 because they are given by the question statement, and we have to find the value of Cp.
Solve the equation for Cp and use the given values to find its value:
[tex]\begin{gathered} Cp=\frac{Q}{m\cdot(T2-T1)} \\ Cp=\frac{2547J}{51.72g(123.4\degree C-23.5\degree C)} \\ Cp=\frac{0.49J}{g\degree C} \end{gathered}[/tex]The specific heat of the substance is 0.49J/g°C.
According to Newton's Second Law, which of the following is TRUE?
Answer: the second one
Explanation:
Answer:
there's no answer choices?
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. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings.
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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The volume of a gas is 200 mL at 330.0 kPa what will the volume be when the pressure is reduced to 45.0 kPa assuming the temperature remains constant
Answer
V2 = 1466.7 mL
Explanation
Given:
Volume 1 = 200 mL
Pressure 1 = 330.0 kPa
Pressure 2 = 45.0 kPa
Required: Volume 2
Solution:
To solve this problem we will use Boyles law
P1V1 = P2V2
V2 = P1V1/P2
V2 = (330.0 kPa x 200 mL)/45.0 kPa
V2 = 1466.7 mL
Why are valence electrons so important?A.They determine what element on the periodic table the atom is.B.They do not form any bonds.C.They are the electrons that participate in chemical reactions.D.They are in the nucleus of the atom.
Answer:
Explanation:
C
Answer:
I think the answer to your question is option A.
A single electron in an orbital has quantum numbers n = 2, ℓ = 0, mℓ = 0, ms = ½. what are the quantum numbers for the next electron added to this atom?
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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How do you determine the ksp of copper carbonate with an absorption of 0.57 mol/L?
When copper carbonate disolves the following happens:
[tex]CuCO_3\rightarrow Cu^{+2}+CO_3^{-2}[/tex]The formula for the solubility product constant is:
[tex]Ksp=\text{ }\lbrack Cu^{+2}\rbrack x\lbrack CO_3^{-2}\rbrack[/tex]
As for every copper ion in solution there is one carbonate ion, we know that the concentration of both ions in solution is 0.57mol/l.
Now we calculate the constant:
[tex]Ksp=0.57\frac{mol}{L}\text{ x }0.57\frac{mol}{L}=\text{ }0.3249\text{ }\frac{mol^2}{L^2}[/tex]So the answer is Ksp= 0.3249 mol2/L2
The sheet of gold foil Rutherford used was 304 mm wide and 0.016 mm thick. What maximum length of gold foil could be made from 1.10 x 103 g of gold?
The maximum length of gold foil could be 1171.7 cm made from 1.10 x 10³ g of gold.
What is the density?The density of an object can be described as the mass per unit volume. The average density is equal to the total mass divided by its total volume.
The mathematical formula of the density of the material can be expressed as follows:
Density = Mass/Volume
The density of a substance is an intrinsic property as it doesn't depend on its size and the S.I. unit of the density is Kg/m³.
Given the width of the gold foil, w = 304 mm = 30.4 cm
The height or thickness of the foil, h = 0.016 mm = 0.0016 cm
The density of the gold foil, d = 19.3 g/cm³
The mass of the gold given, m = 1100 g
The volume of the foil = m/d = 1100/ 19.3 = 56.99 g/cm³
As we know that the volume of gold foil , V = l × w × h
l = V/(w × h)
l = 56.99/(30.4 × 0.0016)
l =1171.7 cm
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At 571.6 mmHg and 25 °C, a gas sample has a volume of 2,275 ml Determine the final pressure (in mmHg) at a volume of 1,255 mL and a temperature of 175°C? Show all your work
Here, there are 2 conditions of the gas here.
The next equation is used: (1)
[tex]\frac{P1xV1}{T1}=\frac{P2xV2}{T2}[/tex]Data: conditions 1
P1 = pressure, in mmHg = 571.6 mmHg
T1 = temperature, in K = 25 °C + 273 = 298 K
V1 = 2,275 mL
-------------
Data: conditions 2
P2 = needs to be calculated
T2 = 175 °C + 273 = 448 K
V2 = 1,255 mL
--------------
From (1), P2 is cleared:
(P1 x V1/T1) x T2/V2 = P2
(571.6 mmHg x 2,275 mL/298 K) x (448 K/1,255 mL) = P2
1558 mmHg = P2
Answer: P2 = 1558 mmHg
What is the mass of 32.1 mL the density of copper is 8.96 g/mL
Answer:
288 g.
Explanation:
Measurements => Density.
Density is the ratio of the mass of an object to its volume:
[tex]D=\frac{m}{V},[/tex]where D is density, m is mass, and V is volume.
We have two data: the volume (32.1 mL) and the density (8.96 g/mL) and we need to find the mass.
We can solve for 'm' in the given equation and replace the given data, as follows:
[tex]\begin{gathered} m=D\cdot V, \\ \\ m=8.96\frac{g}{mL}\cdot32.1\text{ mL,} \\ \\ m=287.6\text{ g}\approx288\text{ g.} \end{gathered}[/tex]The answer would be that the mass is 288 g.
Calculate the amount of zinc present in zinc carbonate.
Ca + ZnCO2(aq) --> CaCO3(aq) + Zn
The group of organic substances known as organic carbonic acids includes zinc carbonate. Compounds with the carbonic acid functional group are known as organic carbonic acids. Zinc carbonate is a substance with a very low acidity
Explain about the Zinc carbonate?An odourless, white, sand-like substance known as zinc carbonate. Cosmetics, lotions, ceramics, pottery, rubber, feed additives, and medications all use it.
Zinc (Zn), carbon (C), and oxygen make up the inorganic compound known as zinc carbonate (O). ZnCO3 is its chemical composition. Oxygen is -2, carbon is +4, and zinc has an oxidation state of +2.
With the chemical formula ZnCO3, zinc carbonate is a white, insoluble zinc salt. By reacting with the proper amounts of sulphate, it can be used to create the majority of straightforward zinc salts. Smithsonite, also known as zinc spar, is a mineral that contains zinc carbonate.
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1. Explain why sulfur has a larger atomic radius than chlorine, even though chlorine has more protons, neutrons and electrons.
Sulphur has a larger atomic radius than chlorine, even though chlorine has more protons, neutrons and electrons because sulfur is to the left of chlorine in the periodic table.
What is atomic radius?Atomic radius is defined as the distance between the atomic nucleus of an atom to the electron which is located at the outermost shell of the atom.
In the periodic table, the elements are being arranged in groups and periods with respect to their various atomic mass and numbers.
The atomic radius decreases across the period but increases down the group of the periodic table.
Therefore, sulphur would probably have a larger atomic radius when compared with chloride because it is located to the left of chloride in the periodic table.
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