Name:___________________________________ Period:_____________ Date:_________________
Practice Problems Stoichiometry
Mass-Mass Conversions
#1. First balance the equation then determine how much acetylene gas (C2H2) is produced by
adding water to calcium carbide (CaC2).
CaC2 (s) +
H2O(l) 
C2H2(g) +
Ca(OH)2 (aq)
How many grams of acetylene are produced by adding water to 5.00 g of CaC2?
Knowns:
mass of CaC2
mole ratio of CaC2/ C2H2
molar mass of C2H2
molar mass of CaC2
#2. First balance the equation then figure out how many grams of dinitrogen
tetrafluoride can be produced from 225 g of fluorine?
F2(g) +
Knowns:
NH3(g) 
N2F4(g) +
mass of F2
mole ratio of N2F2/F2
molar mass of N2F2
molar mass of F2
HF(g)