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

10. Mole Ratio in chemical equation: Determining mole ratio in balanced equations

1. In the reaction: Fe2O3 + 3CO --------------- > 2Fe + 3CO2
What is the mole ratio of Fe2O3 to Fe in the reaction?

1) 1 : 1 2) 3 : 1 3) 1 : 2 4) 2 : 3

2. In the reaction below:
4Al + 3O2 ------------------- > 2Al2O3
cv The mole ratio of Al reacted to Al2O3 produced is
1) 2: 1 2) 2 : 4 3) 1 : 1 4) 2 : 3

3. Given the reaction:
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N2 + 3H2 --------------- > 2NH3
What is the mole ratio of N2 reacted to NH3 produced?
1) 1 : 1 2) 1 : 2 3) 1 : 6 4) 1 : 3

4. Given the reaction:
2C2H6 + 7O2 - -------> 4CO2 + 6H2O

What is the moles ratio of CO2 produced to moles of C2H6 consumed?
1) 1 to 1 2) 2 to 1 3) 3 to 2 4) 7 to 2

5. Given the combustion reaction
2C2H2(g) + 5O2(g) ---------- > 4CO2(g) + 2H2O(l)
What is the mole ratio C2H2 to O2 reacted?
1) 4 : 5 2) 1 : 1 3) 5 : 2 4) 2 : 5

6. Given the reaction:
3Cu + 8HNO3 ----------------- > 3Cu(NO3)2 + 2NO + 4H2O
The mole ratio of NO produced to HNO3 reacted is

1) 4 : 1 2) 2 : 3 3) 1 : 4 4) 2 : 3

11. Mole – Mole problems: Determining mole of a substance in a chemical reaction

1. Given the reaction:
C3H8 + 5O2 --------------- > 3CO2 + 4H2O
How many moles of oxygen are required to produce 1.5 moles of CO2?
1) 1.5 2) 2.5 3) 3.0 4) 5.0
2. In the reaction
2K + S ------------- > K2S
What is the total number of moles of sulfur that will react with 4 moles of potassium?
1) 0.5 mole 2) 1.0 mole 3) 2.0 mole 4) 4.0 mole

3. Given the reaction
2C2H6 (g) + 7O2(g) --------- > 4CO2 (g) + 6H2O(l)

How many moles of CO2 are produced from the combustion of one mole of C2H6?

4) 4
3) 3

1) 1
2) 2

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