1. 9. 2 C3H7OH + 9 O2 → 6 CO2 + 8 H2O a) 6 mol CO2 2 mol C3H7OH
Identify some mole ratios, using the given equation for the
combustion of isopropyl alchol.
a) 6 mol CO2
2 mol C3H7OH
c) 9 mol O2
6 mol CO2
b) 2 mol C3H7OH
9 mol O2
d) 8 mol H2O
e) 6 mol CO2
8 mol H2O
f) 8 mol H2O

2. Mole Ratios 3 CaCl2 + 2 H3PO4 → Ca3(PO4)2 + 6 HCl
Identify some mole ratios, using the given equation.
a) 3 CaCl2 b) 6 HCl c) 3 CaCl2
1 Ca3(PO4) H3PO H3PO4
d) 1 Ca3(PO4)2 e) 6 HCl f) 2 H3PO4
2 H3PO Ca3(PO4) HCl

3. 11. C2H5OH O2 → 2 CO H2O
How many moles of CO2 can be produced from
7.75 mol C2H5OH?
7.75 mol C2H5OH 2 mol CO2 = mol CO2
1 mol C2H5OH or
2 mol CO2 = X = mol CO2
1 mol C2H5OH mol C2H5OH

4. 4 HCl + O2 → 2 Cl H2O
How many moles of Cl2 can be produced from
5.60 mol HCl?
5.60 mol HCl mol Cl2 = 2.80 mol Cl2
4 mol HCl or
2 mol Cl2 = X = mol Cl2
4 mol HCl mol HCl

5. 13. MnO HCl → Cl2 + MnCl H2O
 How many moles of HCl will react with
1.05 mol MnO2?
1.05 mol MnO2 4 mol HCl = 4.20 mol HCl
1 mol MnO2 or
1.05 mol MnO2 = 1 mol MnO2
X mol HCl 4 mol HCl
X = 4.20 mol HCl

6. 100.0 g Al4C3 1 mol Al4C3 12 mol H2O = 8.333 mol H2O
14. Al4C H2O → Al(OH) CH4
How many moles of water are needed to react with 100. g Al4C3 ?
How many moles of Al(OH)3 will be produced when mol
of CH4 is formed?
100.0 g Al4C3 1 mol Al4C mol H2O = mol H2O
144.0 g Al4C mol Al4C3
0.600 mol CH mol Al(OH)3 = mol Al(OH)3
3 mol CH4

7. Ca(OH)2 + Na2CO3 → 2 NaOH + CaCO3
15.
Ca(OH)2 + Na2CO3 → 2 NaOH + CaCO3
How many grams of sodium hydroxide can be produced from
500 g of calcium hydroxide according to this equation?
1 mole Ca(OH) 2 = 74.1 g Ca(OH) 2 = g
2 moles NaOH g NaOH x
74.1 x = x = 540 g NaOH

8. How many grams of zinc phosphate, Zn3(PO4)2,
are formed when 10.0 g of Zn are reacted with
phosphoric acid?
3 Zn H3PO4 → Zn3(PO4) H2
10.0 g
? g
3 mol Zn
1 mol Zn3(PO4)2
= g Zn
386.1 g Zn3(PO4)2
196.2 g Zn = g Zn
386.1 g Zn3(PO4)2 X g Zn3(PO4)2
X = 19.7 g Zn3(PO4)2

9. 17.
Fe2O C → 2Fe + CO
How many kilograms of iron would be
formed from 125 kg of Fe2O3?
1 mole Fe2O3 = kg = 125 kg
2 mole Fe kg x
x =
x = = kg Fe
0.1598

10. 18.How many grams of steam and iron must react to
produce 375 g of magnetic iron oxide, Fe3O4?
3 Fe H2O → Fe3O H2
3 mol Fe
1 mol Fe3O4
= g Fe
231.6 g Fe3O4
= X g Fe
375 g Fe3O4
X = 271 g Fe
4 mol H2O
1 mol Fe3O4
= 72.0 g H2O
231.6 g Fe3O4
= X g H2O
375 g Fe3O4
X = 117 g H2O

11. 19. a. 2C2H6 + 7O2 → 4CO2 + 6H2O 7 mole O2 = X mole O2
How many moles of O2 are needed for the complete combustion
of 15.0 mol of ethane?
7 mole O = X mole O2
2 mole C2H mole C2H6
2x = 105
x = 52.5 mole O2

12. 19 b. 2C2H6 + 7O2 → 4CO2 + 6H2O 4 mole CO2 = 176 g CO2 = Xg CO2
How many grams of CO2 are produced for each 8.00 g of H2O
produced?
4 mole CO2 = 176 g CO2 = Xg CO2
6 mole H2O g H2O gH2O
108x = 1408
x = = g CO2
108

13. 19 c. 2C2H6 + 7O2 → 4CO2 + 6H2O 4 mole CO2 = 2 = 88.0 g CO2 = x
How many grams of CO2 will be produced by the combustion of 75.0 g of C2H6?
4 mole CO2 = = 88.0 g CO2 = x
2 mole C2H g C2H
30x = 6600
x = = g CO2 30

14. 20. 4 FeS O2 → 2 Fe2O SO2
How many moles of Fe2O3 can be made from
1.00 mol of FeS2 ?
4 mol FeS2
2 mol Fe2O3
= mol FeS2
X mol Fe2O3
X = mol Fe2O3

15. 20. 4 FeS O2 → 2 Fe2O SO2
(b) How many moles of O2 are required to react with
4.50 mol of FeS2 ?
4 mol FeS2
11 mol O2
= 4.50 mol FeS2
X mol O2
X = 12.4 mol O2

16. 20. 4 FeS O2 → 2 Fe2O SO2
(c) If the reaction produces 1.55 mol of Fe2O3 , how
many moles of SO2 are produced?
2 mol Fe2O3
8 mol SO2
= mol Fe2O3
X mol SO2
X = 6.20 mol SO2

17. 20. 4 FeS O2 → 2 Fe2O SO2
(d) How many grams of SO2 can be formed from
0.512 mol of FeS2 ?
0.512 mol FeS2
8 mol SO2
4 mol FeS2
= 1.02 mol SO2
1.02 mol SO2
64.1 g SO2
1 mol SO2
= g SO2

18. 20. 4 FeS O2 → 2 Fe2O SO2
(e) If the reaction produces 40.6 g of SO2 , how
many moles of O2 were reacted?
40.6 g SO2
1 mol SO2
64.1 g SO2
= mol SO2
0.633 mol SO2
11 mol O2
8 mol SO2
= mol O2

19. 20. 4 FeS O2 → 2 Fe2O SO2
(f) How many grams of FeS2 are needed to produce
221 g of Fe2O3 ?
221 g Fe2O3
1 mol Fe2O3
159.7 g Fe2O3
= mol Fe2O3
1.38 mol Fe2O3
4 mol FeS2
2 mol Fe2O3
120.0 g FeS2
1 mol FeS2
= mol FeS2
2.76 mol FeS2
= 331 g FeS2

20. 20. 4 FeS O2 → 2 Fe2O SO2
(f) How many grams of FeS2 are needed to produce
221 g of Fe2O3 ?
4 mol FeS2
2 mol Fe2O3
= g FeS2
319.4 g Fe2O3
= X g FeS2
221 g Fe2O3
X = 332 g FeS2

21. 22.
a) 2 Bi(NO3) H2S → Bi2S HNO3
50.0 g g ? g
2 Bi(NO3)3 = 790 g Bi(NO3)3 = g Bi(NO3)3
1 Bi2S g Bi2S X grams Bi2S3
X = 32.6 grams
3 H2S = g H2S = g H2S
1 Bi2S g Bi2S3 X g Bi2S3
H2S limits X = 30.2 grams

22. 22.
b.) 3 Fe H2O → Fe3O H2
40.0 g g ? grams
3Fe = g Fe = 40.0 g Fe x= 1.91 g H2
4H g x g H2
4H2O = 1H2O = 18.0g H2O = 16.0 g H2O
4H H g H2 x g H2
H2O limiting x= 1.78 g H2

23. 23) a) C3H8 + 5 O2 → 3 CO2 + 4 H2O
  g g ? mol
20.0 g C3H8 1 mol C3H8 3 mol CO2 = 1.36 mol CO2
44.0 g C3H8 1 mol C3H8
20.0 g O2 1 mol O2 3 mol CO2 = mol CO2
32.0 g O2 5 mol O2

24. 23 b)
C3H8 + 5 O2 → 3 CO2 + 4 H2O
  g g ? mol
20.0 g C3H8 1 mol C3H8 3 mol CO2 = 1.36 mol CO2
44.0 g C3H8 1 mol C3H8
80.0 g O mol O2 3 mol CO2 = mol CO2
32.0 g O mol O2

25. 24. C3H8 + 5O2 → 3CO2 + 4H2O 1C3H8 = 5C3H8 X = 15 mole CO2 3 CO2 X
5.0 mole mole ? Moles
1C3H8 = 5C3H8 X = 15 mole CO2
3 CO X
5O2 = X = 3.0 mole CO2
3CO2 X
O2 limits

26. 24. C3H O2 → 3CO H2O
3.0 mole mole ? moles
b) 1 mole C3H8 = C3H8
3 mole CO X
X = 9.00 mole CO2
C3H8 limits
5 mole O2 = 20. O2
3 mole CO X X = 12 mole CO2

27. 24. C3H O2 → 3CO H2O
3.0 mole mole ? moles
24c)
1 C3H8 = 20 C3H8
3 CO X
X = 60 mol CO2
5 O2 = 3 O2
X = 1.8 mol CO2
O2 limits

28. 27)
2 Al Br2 → 2 AlBr3
25.0 g g ? g
If 64.2 g of AlBr3 is recovered, what is the percent yield?
2 mol Al = g Al = g Al X = 247 g
2 mol AlBr g AlBr3 X g AlBr3
3 mol Br2 = g Br2 = g Br2 X = g
2 mole AlBr g AlBr3 X g AlBr3
% yield = Actual (lab) x 100 = g = % Calculated (theory) g