1. Chemistry, The Central Science, 11th edition
Theodore L. Brown; H. Eugene LeMay, Jr.;
Bruce E. Bursten and Catherine J. Murphy
Chapter 3 Stoichiometry: Calculations with Chemical Formulas and Equations
Donna Narsavage Heald
Siena College
Loudonville, NY
 2009, Prentice Hall

2. How many oxygen atoms are present in MgSO4 • 7 H2O?

3. How many oxygen atoms are present in MgSO4 • 7 H2O?

4. How many sulfur atoms are present in 1.0 mole of Al2(SO4)3?
6.0 x 1023 sulfur atoms
1.8 x 1024 sulfur atoms

5. How many sulfur atoms are present in 1.0 mole of Al2(SO4)3?
6.0 x 1023 sulfur atoms
1.8 x 1024 sulfur atoms

6. If you have equal masses of the following metals, which will have the most number of atoms?
lithium
sodium
potassium
rubidium
calcium
An alkali metal
Ca in H2O

7. If you have equal masses of the following metals, which will have the most number of atoms?
lithium
sodium
potassium
rubidium
calcium
An alkali metal
Ca in H2O

8. How many moles of oxygen gas are required to react completely with 1
How many moles of oxygen gas are required to react completely with 1.0 mole NO?
2 NO (g) O2 (g) NO2 (g)
0.5 mol O2
1.0 mol O2
1.5 mol O2
2.0 mol O2
2.5 mol O2

9. How many moles of oxygen gas are required to react completely with 1
How many moles of oxygen gas are required to react completely with 1.0 mole NO?
2 NO (g) O2 (g) NO2 (g)
0.5 mol O2
1.0 mol O2
1.5 mol O2
2.0 mol O2
2.5 mol O2

10. If 10. 0 moles of NO are reacted with 6
If 10.0 moles of NO are reacted with 6.0 moles O2, how many moles NO2 are produced?
2 NO (g) O2 (g) NO2 (g)
2.0 mol NO2
6.0 mol NO2
10.0 mol NO2
16.0 mol NO2
32.0 mol NO2

11. If 10. 0 moles of NO are reacted with 6
If 10.0 moles of NO are reacted with 6.0 moles O2, how many moles NO2 are produced?
2 NO (g) O2 (g) NO2 (g)
2.0 mol NO2
6.0 mol NO2
10.0 mol NO2
16.0 mol NO2
32.0 mol NO2

12. If 10. 0 moles of CO are reacted with 6
If 10.0 moles of CO are reacted with 6.0 moles O2, how many moles of the excess reagent remain?
2 NO (g) O2 (g) NO2 (g)
1.0 mol O2
5.0 mol O2
4.0 mol NO
8.0 mol NO
None of the above

13. If 10. 0 moles of CO are reacted with 6
If 10.0 moles of CO are reacted with 6.0 moles O2, how many moles of the excess reagent remain?
2 NO (g) O2 (g) NO2 (g)
1.0 mol O2
5.0 mol O2
4.0 mol NO
8.0 mol NO
None of the above