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. matics of formulas and equations
Topic 6: Mole and stoichiometry - Mathe

12. Volume – volume problems: Determining volume of a substance in a chemical reaction
1. According to the reaction below:
2SO2 (g) + O2(g) -------- > 2 SO3(g)

What is the total number of liters of O2(g) that will react completely with 89.6 liters of SO2 at STP?
1) 1.0 L 2) 0.500 L 3) 22.4 L 4) 44.8 L
2. Given the reaction:
C2H4 + 3O2 ------------ > 2CO2 + 2H2O
How many liters of CO2 are produced when 15 liters of O2 are consumed?
1) 10 L 2) 15 L 3) 30 L 4) 45 L

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3. Given the reaction:
2C2H6(g) + 7O2(g) ------- > 4CO2(g) + 6H2O(g)
What is the total number of liters of CO2(g) produced by the complete combustion of 1 liter of C2H6(g)

1) 1 L 2) L 3) 0.5 L 4) 4 L

4. In the balanced chemical reaction equation below:

C3H8 + 5O2 -------------- > 3CO2 + 2H2O
What is the total volume of H2O(g) formed when 8.0 liters of C3H8(g) is completely oxidized at STP?
2) 22.4 L
3) 8.00 L

1) 32.0 L Teacher Preview Copy 4) 4.00 L

13. Mass - mass problems: Determining mass of a substance in a chemical reaction

1. Given the reaction:
Mg + 2HCl -------------- > MgCl2 + H2
What is the total number of grams of Mg consumed when 1 g of H2 is produced?
1) 6.0 g 2) 12 g 3) 3.0 g 4) 24 g

2. Given the reaction:

4Al(s) + 3O2(g) ------------ > 2Al2O3(s)

What is the minimum number of grams of O2 gas required to produce 102 grams of Al2O3?
1) 32.0 g 2) 192 g 3) 96.0 g 4) 48.0 g

3. Given the balanced equation below:
3Cu + 8HNO3 -------- > 3Cu(NO3)2 + 2NO + 4H2O
The total number of grams of Cu needed to produce 188 grams of Cu(NO3)2
1) 64 2) 128 3) 32 4) 124
4. According to the reaction:

2C2H2 + 5O2 --------- > 4CO2 + 2H2O
How many grams of CO2 is produced from reacting 80 grams of C2H2?
1) 160 g 2) 251 g 3) 320 g 4) 176 g

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