STOICHIOMETRY
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Name ___________________________
Hour __________
Always ensure that the equation is correctly balanced. If the equation is wrong, all the
other steps that follow will also be incorrect.
Determine what is the given and the unknown. Next determine what stoich conversion is needed.
Always show all of your work!!! Remember units and formulas!! BrINClHOF!!!!
Problem #1:
2Na + 2HOH  2NaOH + H2
1. How many moles of sodium are required to yield 4 moles of hydrogen?
2. How many moles of water are needed to react completely with 5.5 moles of sodium?
Problem #2:
2KClO3 
2KCl + 3O2
3. How many moles of oxygen gas are released from 2.5 moles of potassium chlorate?
4. How many moles of potassium chlorate are needed to produce 7.5 moles of potassium chloride?
Problem #3:
Write the Equation _______________________________________________
5. Write a balanced equation for the reaction between K and Br2 that forms KBr in the space above.
6.
How many moles of KBr produced from the reaction of 7.50 moles of Br 2?
7. How many moles of K are needed to react completely with 1.8 moles of Br 2?
Mass-to-Mole Conversions
Problem #4:
Mg + 2HCl  MgCl2 + H2
8. How many moles of MgCl2 are produced from 38.0 g of Mg?
9. How many moles of hydrogen are produced from the 38.0 g of Mg?
10. How many moles of hydrochloric acid are needed to produce 16 grams of hydrogen gas?
Mole-to-Mass Conversions
Predict products of the reaction
Problem #5:
2KClO3 
11. How many grams of KClO3 are required to produce 4.50 moles of O2?
12. How many grams of KCl are produced when 3.00 moles of KClO3 react?
13. How many grams of oxygen are produced if 10.25 moles of potassium chloride are produced?
MASS-TO-MASS CONVERSIONS
Problem #6:
2AgNO3 + MgCl2  Mg(NO3)2 + 2AgCl
14. How many grams of silver chloride are produced from 4.25 grams of magnesium chloride?
15. How many grams of silver nitrate are needed to produce 12.3 grams of magnesium nitrate?
Problem #7:
2Al + 6HCl  2AlCl3 + 3H2
16. How many grams of Al are needed to release 0.54 moles of H2?
17. How many moles of AlCl3 are produced from 1.5 moles of aluminum?
18. How many moles of AlCl3 are obtained from 12 grams of HCl?
19. How many grams if hydrochloric acid are needed to release 9.82 grams of hydrogen gas?