Chemistry Worksheet
Stoichiometry/Mass/Mole Relationships
NAME: _____________________________
Block: _________
Balance each reaction, then determine the answer to the question. Show your work, and
observe all significant figures.
1. ___ K + ___ Cl2 → ___ KCl
How many grams K are needed to react with 15 grams of Cl2?
Ans.
2. ___ N2 + ___ H2 → ___ NH3
How many moles of NH3 can be made from 11.25 moles of H2?
Ans.
3. ___ Fe + ___ O2 → ___ Fe2O3?
How many Fe atoms are needed to react with 4.0 x 1023 molecules of O2?
Ans.
4. ___ Ca + ___ P → ___ Ca3P2
How many grams of Ca are needed to make 2.00 moles of Ca3P2?
Ans.
5. ___ Zn + ___ O2 → ___ ZnO
How many moles of zinc are needed to make 500. g of zinc oxide?
Ans.
Copyright © 2007, Alan D. Crosby, Newton South High School, Newton, MA 02459
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Chemistry Worksheet
Stoichiometry/Mass/Mole Relationships
NAME: _____________________________
Block: _________
6. ___ H2 + ___ O2 → ___ H2O
How many molecules of O2 are needed to make 3.50 moles of H2O?
Ans.
7. ___ Fe + ___ O2 → ___ Fe2O3
23
How many moles of O2 are needed to react with 3.01 x 10 iron atoms?
Ans.
8. ___ H2 + ___ O2 → ___ H2O
5.50 grams of hydrogen react with excess oxygen. What is the maximum number of water
molecules that can be formed?
Ans.
9. ___ N2 + ___ O2 → ___ N2O4
23
8.03 x 10 molecules of oxygen react with excess nitrogen. What is the maximum number
of grams of dinitrogen tetroxide that can be produced?
Ans.
10. ___ C6H12 + ___ O2 → ___ CO2 + ___ H2O
42 grams of cyclohexane burns in excess air to from carbon dioxide and water. How many
grams of carbon dioxide and of water vapor are produced?
Ans.
Ans: ___________________
Copyright © 2007, Alan D. Crosby, Newton South High School, Newton, MA 02459
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