Page 240 - Teacher Preview Copy

.
Topic 6: Mole and stoichiometry - Mathematics of formulas and equations

11. Continues
4. In the reaction below:
4NH3 + 5O2 -------- > 4NO + 6H2O

What is the total number of moles of NO produced when 2 moles of O2 is completely consumed?
1) 2.0 moles 2) 2.4 moles 3) 1.6 moles 4) 8.0 moles

5. Given the reaction:
6CO2 + 6H2O ------- > C6H12O6 + 6O2
What is the total number of moles of water needed to make 1.75 moles of C6H12O6?

Teacher Preview Copy
1) 10.5 2) 6 3) 7.5 4) 1.75

6. Given the reaction:
4Fe + 3O2 ----------- > 2Fe2O3
To produce 3 moles of Fe2O3, how many moles of Fe must be reacted?

1) 3 moles 2) 6 moles 3) 4 moles 4) 1.5 moles

7. In the balanced chemical reaction equation below:
C3H8 + 5O2 ---------- > 3CO2 + 2H2O
What is the total number of moles of CO2 produced from reacting 0.25 mole of C3H8?

2) 5

1) 11 Teacher Preview Copy 4) 0.75
3) .8

8. Given the reaction
2Al + 3H2SO4 -------- > 3H2 + Al2(SO4)3
How many moles of H2SO4 are needed to react completely with 7.50 moles of Al?
1) 2.5 moles 2) 5.0 moles 3) 9.0 moles 4) 22.5 moles

9. Given the reaction below:
Mg(s) + 2H2O(l) ------- > Mg(OH)2 (aq) + H2(g)
The number of moles of water needed to react with 3 moles of magnesium is
1) 6 moles 2) 3 moles 3) 0.50 mole 4) 4 moles

10. Given a balanced chemical equation below:

3Cu(s) + 2H3PO4 ----------- > Cu3(PO4)2 + 3H2
How many moles of copper are needed to react with 5 moles of phosphoric acid?
1) 10.0 moles 2) 5.00 moles 3) 15.0 moles 4) 7.50 moles

230 Copyright © 2010 E3 Scholastic Publishing. All Rights Reserved. Survivingchem.com