Chemistry Problem Set: D6
More Limiting Reactants/Reagents
Block: ____ Name: ________________
1) Hydrazine (N2H4) and hydrogen peroxide (H2O2) are sometimes used as the fuel in rockets.
a) Write the balanced chemical reaction.
____ N2H4 + ____ H2O2  ___ N2 + ___ H2O
b) Suppose 7.5 mol of N2H4 reacts with 5.0 mol of H2O2.
i)
What is the limiting reagent?
ii) What is the excess reagent?
iii) What mass (in grams) of the excess reagent remains after the reaction has completed?
iv) How many grams of water are produced?
2) When acetylene (C2H2) burns in oxygen, it produces carbon dioxide and water plus a great deal of heat. It is used in some types
of welding.
a) Write the balanced chemical reaction.
b) Suppose you had 5.6 g of C2H2 and 3.2 mol of O2.
i)
What is the limiting reagent?
ii) What mass of CO2 is produced?
iii) What mass (in grams) of the excess reagent remains after the reaction has completed?
3) Zinc sulfide and oxygen gas react when heated to form zinc oxide and sulfur dioxide.
a) Write the balanced chemical reaction.
b) Suppose you had 253.7 g of zinc sulfide and 128.0 g of oxygen gas.
i)
What is the limiting reagent?
ii) What mass of sulfur dioxide is produced?
iii) What mass (in grams) of the excess reagent remains after the reaction has completed?
4) Molten (hot liquid) sodium carbonate reacts with aluminum oxide to make carbon dioxide and sodium aluminate (NaAlO 2).
a) Write the balanced chemical reaction.
b) Suppose you had 203.9 g of aluminum oxide reacting with 530 g of sodium carbonate.
i)
What is the limiting reagent?
ii) How many grams of the excess reagent remain?
iii) How many grams of sodium aluminate are formed?
Answers (IRO+1) :
85.17
18.95
318.02 325.85 3.06
166.58 160
180
101.96