41) If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to

 

41) If the percent yield for the following reaction is 65.0%, how many grams of KClO3 are needed to produce 42.0 g of O2?

2 KClO3(s) → 2 KCl(s) + 3 O2(g)

A) 69.7 g

B) 107 g

C) 165 g

D) 371 g

42) If the percent yield for the following reaction is 75.0%, and 45.0 g of NO2 are consumed in the reaction, how many grams of nitric acid, HNO3(aq), are produced?

3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

A) 30.8 g

B) 41.1 g

C) 54.8 g

D) 69.3 g

43) In the reaction between glucose and oxygen, 10.0 g of glucose reacts and 7.50 L of carbon dioxide is formed. What is the percent yield if the density of CO2 is 1.26 g/L?

C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l)

A) 26.1%

B) 40.6%

C) 43.1%

D) 64.5%

44) When methane, CH4, undergoes combustion with oxygen, the usual products are carbon dioxide and water. Carbon monoxide is formed when the limiting reactant is

A) carbon dioxide.

B) methane.

C) oxygen.

D) water.

45) 10 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below. Which one of the following statements is false?

N2(g) + 3 H2(g) → 2 NH3(g)

A) 2.8 grams of hydrogen are left over.

B) Hydrogen is the excess reactant.

C) Nitrogen is the limiting reactant.

D) The theoretical yield of ammonia is 15 g.

46) 5.0 g of iron is reacted with 5.0 g of water according to the chemical equation shown below. Which one of the following statements is false?

3 Fe(s) + 4 H2O(l) → Fe3O4(s) + 4 H2(g)

A) 6.91 g of Fe3O4 are produced.

B) 2.85 g of H2O are left over.

C) Mass is conserved in this reaction.

D) Water is the limiting reactant.

47) Which substance is the limiting reactant when 2.0 g of sulfur reacts with 3.0 g of oxygen and 4.0 g of sodium hydroxide according to the following chemical equation:

2 S(s) + 3 O2(g) + 4 NaOH(aq) → 2 Na2SO4(aq) + 2 H2O(l)

A) S(s)

B) O2(g)

C) NaOH (aq)

D) None of these substances is the limiting reactant.

48) When 5.00 × 1022 molecules of ammonia react with 4.00 × 1022 molecules of oxygen according to the chemical equation shown below, how many grams of nitrogen gas are produced?

4 NH3(g) + 3 O2(g) → 2 N2(g) + 6 H2O(g)

A) 1.16 g

B) 1.24 g

C) 2.79 g

D) 4.65 g

49) How many grams of the excess reagent are left over when 6.00 g of CS2 gas react with 10.0 g of Cl2 gas in the following reaction:

CS2(g) + 3 Cl2(g) → CCl4(l) + S2Cl2(l)

A) 2.42 g

B) 2.77 g

C) 3.58 g

D) 4.00 g

50) When silver nitrate reacts with barium chloride, silver chloride and barium nitrate are formed. How many grams of silver chloride are formed when 10.0 g of silver nitrate reacts with 15.0 g of barium chloride?

A) 8.44 g

B) 9.40 g

C) 11.9 g

D) 18.8 g