1. Nitrogen gas can be prepared by passing gaseous ammonia over solid copper(II) oxide at high temperatures. The other products of the reaction are solid copper and water vapor. a. If a sample containing 18.1 g of NH3 is reacted with 90.4 g of CuO, which is the limiting reactant? b. How many grams of N2 will be formed
1. Nitrogen gas can be prepared by passing gaseous ammonia over solid copper(II) oxide
at high temperatures. The other products of the reaction are solid copper and water vapor.
a. If a sample containing 18.1 g of NH3 is reacted with 90.4 g of CuO, which is the
limiting reactant?
b. How many grams of N2 will be formed?
2. Methanol (CH3OH), also called methyl alcohol, is the simplest alcohol. It is used as a fuel
in race cars and is a potential replacement for gasoline. Methanol can be manufactured by
combination of gaseous carbon monoxide and hydrogen. Suppose 68.5 kg CO(g) is reacted
with 8.60 kg H2(g).
a. Calculate the theoretical yield of methanol.
b. If 3.57 × 104 g CH3OH is actually produced, what is the percent yield of methanol?
3. One of the steps in the commercial process for converting ammonia to nitric acid involves
the conversion of NH3 to NO:
4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(s)
a. If 1.00 g of NH3 and 1.50 g of O2 are mixed, which is the limiting reactant?
b. What is the theoretical yield (in grams) of NO that can be produced when the
quantities in part a are mixed?
c. If 1.05 g of NO are actually obtained from the reaction, what is the percent yield?
4. Use the chemical equation below to answer the following questions:
2 NaCl + Pb(NO3)2 → 2 NaNO3 + PbCl2
a. How many grams of lead(II) chloride are produced from the reaction of 15.3 g of
NaCl and 60.8 g of Pb(NO3)2?
b. What is the limiting reactant?
c. How much excess is left over?
5. Use the chemical equation below to answer the following questions:
CH4(g) + 2 H2O(g) → 4 H2(g) + CO2(g)
a. How many grams of hydrogen can be produced from the reaction of 80.0 g of CH4
and 16.3 g of water?
b. What is the limiting reactant?
6. Use the chemical equation below to answer the following questions:
Al + FeCl3 → Fe + AlCl3
a. 3.6 grams of aluminum are put in a container with 9.8 grams of FeCl3. How many
grams of iron can be produced?
b. Identify the limiting reactant and the excess reactant in the given chemical
reaction.
c. If 2.5 g of Fe resulted from the reaction, what was the percent yield?
7. Use the chemical equation below to answer the following questions:
2 Fe + 3 Cl2 → 2 FeCl3
Q. 20. grams of iron reacted with 15 grams of chlorine. 22 grams of iron (III) chloride
were recovered from the experiment, which means the reaction had what percent yield?
8. Use the chemical equation below to answer the following questions:
2 Ga + 3 S → Ga2S3
a. What is the theoretical yield in grams of the reaction between 3.5 grams of gallium
and 13 grams of sulfur?
b. Identify the limiting reactant and the excess reactant in the given chemical
reaction.
c. How much of the excess reactant is left after the reaction?
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