Balancing and Percent Yield Quiz

Pentane (C5H12) reacts with oxygen (O2) to form carbon dioxide (CO2) and water (H2O) according to the following reaction. Answer the following question(s) about this reaction. 

C5H12(l) + ? O2(g) → ? CO2(g) + ? H2O(g)

What is the coefficient for oxygen in the balanced equation?

8

When 100.g Mg3N2 reacts with 75.0 g H2O, what is the maximum theoretical yield of NH3?

Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)

23.6 g

For the following reaction, what is the correct coefficient for the H₂? 

Fe(s) + HCl(aq) → FeCl3(aq) + ? H2(g)

3

When 50.0 g of acetylene is allowed to react with excess oxygen, 75.0 g of CO2 are formed. What is the percent yield of carbon dioxide?

2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

acetylene

44.4%

If 0.500 mol of acetylene is allowed to completely react with oxygen, what is the final yield of CO2 in moles?

2 C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

acetylene

1.00 mol

How many grams of H2O are needed to produce 150. g of Mg(OH)2?

Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)

92.6 g

Which of the following gives the balanced equation for this reaction? 

K3PO4(aq) + Ca(NO3)2(aq) → Ca3(PO4)2(s) + KNO3(aq)

2K3PO4 + 3Ca(NO3)2 → Ca3(PO4)2 + 6KNO3

When lead(II) nitrate reacts with sodium iodide, what is the correct formula for the product lead(II) iodide?

PbI2

If 40.0 g of acetylene is allowed to react with 40.0 g of oxygen, how many grams of CO2 are formed? 

2C2H2(g) + 5O2(g) → 4CO2(g) + 2H2O(g)

acetylene

44.0 g

What coefficient is placed in front of O2 to complete the balancing of the following equation? 

C5H8(l) + ? O2(g) → 5CO2(g) + 4H2O(g)

7

When 355 kJ of heat is produced, what mass of H2O is also produced? 

2H2(g) + O2(g) → 2H2O(l) + 572 kJ

22.4 g

When barium chloride is allowed to react with silver nitrate to give barium nitrate and silver chloride, what are the coefficients for the balanced equation? 

___BaCl2(aq) + ___AgNO3(aq) → ___AgCl(s) + ___Ba(NO3)2(aq)

1, 2, 2, 1

How many moles of hydrogen are needed to react with 0.234 mol of oxygen according to this equation? 

2H2(g) + O2(g) → 2H2O(g)

0.468 mol

In this reaction, what is the correct coefficient for sodium chloride? 

Pb(NO3)2(aq) + ? NaCl(aq) → PbCl2(s) + ? NaNO3(aq)

2

For the reaction of carbon dioxide to form carbon monoxide and oxygen, ΔH is 570 kJ. How many grams of CO2 will react if 450 kJ is absorbed? 

2CO2(g) → 2CO(g) + O2(g)

ΔH = +570 kJ

69 g

When 36.0 g of H2O react, how many grams of NH3 are produced? 

Mg3N2(s) + 6H2O (l) → 3Mg(OH)2(aq) + 2NH3(g)

11.3 g

A reaction between methane and hydrogen sulfide to produce carbon disulfide and hydrogen gas was carried out.

CH4(g) + 2H2S(g) → CS2(g) + 4H2(g)

A 32.0 g quantity of methane produced 70.0 g of carbon disulfide. What was the percent yield for this reaction?

46.1%

What are the coefficients for the balanced equation? 

___Al2(SO4)3(aq) + ___KOH(aq) → ___Al(OH)3(s) + ___K2SO4(aq)

1, 6, 2, 3

In the reaction of aluminum and iron(III) oxide to form iron and aluminum oxide, ΔH is -850 kJ. How many kJ are released when 10. g of Al react? 

2Al(s) + Fe2O3(s) → 2Fe(s) + Al2O3(s)

ΔH = -850 kJ

160 kj

When 100.g Mg3N2 reacts with 75.0 g H2O, 15.0 g of NH3 is formed. What is the % yield?

Mg3N2(s) + 6H2O(l) → 3Mg(OH)2(aq) + 2NH3(g)

63.6%

Find the mass of AlCl3 that is produced when 25.0 grams of Al2O3 react with HCl according to the following balanced equation. 

Al2O3(s) + 6HCl(aq) → 2AlCl3(aq) + 3H2O(l)

65.4 g

In the following reaction, what is the correct coefficient for aluminum chloride? 

Al(s) + Cl2(g) → ? AlCl3(s)

2

For the reaction of carbon dioxide to form carbon monoxide and oxygen, ΔH is + 570 kJ. This reaction is ________. 

2CO2(g) → 2CO(g) + O2(g)

ΔH = + 570 kJ

Endothermic

How many moles of water are produced from the reaction of 0.112 mol of oxygen according to this equation? 

2H2(g) + O2(g) → 2H2O(g)

0.224 mol

What is the coefficient of hydrogen, H2, when the following equation is balanced? 

Al(s) + H2SO4(aq) → Al2(SO4)3(aq) + ? H2(g)

2