Name_______________________________
Mixed Stoichiometry Practice
1. Potassium Chlorate decomposes into potassium chloride and oxygen gas.
Balanced Equation:
___KClO4  ___KCl + ____O2
2. How many grams of oxygen are produced when 4.0 moles of potassium chlorate
decompose completely?
3. Butane (C4H10) undergoes combustion.
Balanced Equation:
___ C4H10(l) + ___ O2(g)  ____ CO2(g) + _____ H2O(l)
4. How many molecules of CO2 are produced when 83 g of O2 are reacted with an excess
of butane?
5. Balanced Equation:
___H2 + ___O2  ___H2O
6. How many grams of hydrogen will be required to react with 1.25 x 1025 molecules of
oxygen?
7. How many grams of water can be produced using 11.00 moles of hydrogen?
8. Cobalt(II) chloride reacts with fluorine in a single replacement reaction to produce
cobalt(II) fluoride and chlorine gas.
Balanced Equation:
_____ CoCl2 + _____ F2  _____ CoF2 + _____ Cl2
9. How many molecules of fluorine are required to produce 287.8 g of cobalt(II)fluoride?
10. Balance the following equation.
____ SrCl2(aq) + _____ H2SO4(aq)  _____HCl(aq) + ____SrSO4(s)
11. What is the mass of strontium chloride that reacts with 450.0 g of sulfuric acid?
12. Solid iron(III) oxide reacts with hydrogen gas to form solid iron and water.
Write the balanced equation:
13. How many grams of iron are produced when 450 grams of iron(III) oxide are reacted?
14. How many grams of water will be produced when 0.0155 moles of hydrogen gas react
completely with iron(III) oxide?
Balance the Equation:
_____ Na2CO3 + _____ HCl  _____ H2O + ______ CO2 + _____ NaCl
15. If 9.72 grams of sodium carbonate reacted, how many liter of carbon dioxide would be
produced at STP?
16. How many grams of NaCl is produced, if 0.732 L of CO 2 was produced at STP?
17. What is the mass of 0.238 moles of hydrochloric acid?
18. The synthesis of sodium chloride occurs according to the reaction:
Balance the Equation:
____Na(s) + ____ Cl2(g) → ____ NaCl(s)
19. What volume of chlorine at STP is necessary for the complete reaction of 4.81 grams of
sodium metal?
20. Balanced the equation:
____ Sn + ____ HF → ____ SnF2 + ____ H2
21. How many grams of SnF2 are produced when 30 grams of HF is reacted?
22. How many moles of HF will be needed to react with 48 g of Sn?