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Stoich2 – Unit 6
SHOW YOUR WORK
1. How many liters of acetylene gas (C2H2) react at STP to form 15.0 grams of carbon dioxide?
____ C2H2 + ____ O2  ____ CO2 + ____ H2O
2. Calculate the number of grams of hydrazine (N2H4) gas required to make 12.5 L of ammonia (NH3)
at STP.
____ N2H4 + ____ H2  ____ NH3
3. How many grams of manganese (IV) oxide are formed from 120. g of manganese metal?
____ Mn + ____ O2  ____ MnO2
4. What volume of 1.50M calcium perchlorate is required to react with 75.0 mL of 2.5M sulfuric acid?
____ Ca(ClO4)2 + ____ H2SO4  ____ CaSO4 + ____ HClO4
5. How many molecules (particles) of copper (II) hydroxide are required to react with 45 mL of 0.500M
carbonic acid?
____ Cu(OH)2 + ____ H2CO3  ____ CuCO3 + ____ H2O
6. How many grams of water will be produced by 1.5 x 1024 molecules of carbonic acid in the reaction
from #5?
Stoichiometry – Unit 6
LPChem1415:Wz
7. How many grams of water vapor are produced when 1.00 kg of acetylene (C2H2) is burned?
____ C2H2 + ____ O2  ____ CO2 + ____ H2O
8. Calculate the number of grams of chromium (III) iodide that are produced when 210. grams of
sodium iodide reacts.
____ Cr2(CO3)3 + ____ NaI  ____ CrI3 + _____ Na2CO3
9. How many liters of nitrogen gas at STP are needed to react with 150.0 g of titanium?
____ Ti + ____ N2  ____ Ti3N
10. What volume of 0.55M strontium dichromate is required to react with 2.5 x 1025 units (particles) of
cesium thiosulfate?
____ SrCr2O7 + ____ Cs2S2O3  ____ Cs2Cr2O7 + ____ SrS2O3
11. How many atoms of cobalt are required to react with 275 mL of 1.50M permanganic acid?
____ Co + ____ HMnO4  ____ Co(MnO4)4 + ____ H2
12. How many liters of hydrogen gas (at STP) will be produced by 15.5 g of cobalt in the reaction from
#11?
Stoichiometry – Unit 6
LPChem1415:Wz