# Chemical Process Calculation Questions and Answers – Species Mole Balances-II

This set of Chemical Process Calculation Questions focuses on “Species Mole Balances-II”.

1-6. In Ammonia production, a reactor is supplied with a feed of 10 moles of N2¬ and 40 moles of H2. If the reaction takes place completely,
1. What is the extent of the reaction?
a) 10
b) 15
c) 20
d) None of the mentioned

Explanation: Extent of the reaction = Moles reacting in the reaction.

2. What is the number of moles of N2 after the reaction?
a) 0
b) 5
c) 10
d) None of the mentioned

Explanation: The reaction completely takes place, so the moles of NH3 are zero as it is a limiting reactant.

3. What is the number of moles of H2 after the reaction?
a) 10
b) 15
c) 20
d) None of the mentioned

Explanation: Moles of H2 = Initial moles of H2 – 3(Extent of the reaction).

4. What is the number of moles of NH3 after the reaction?
a) 10
b) 15
c) 20
d) None of the mentioned

Explanation: Moles of NH3 = 2(Extent of the reaction).

5. Which one is the limiting reactant?
a) N2
b) H2
c) Both N2 and H2
d) Neither N2 nor H2

Explanation: N2 has lower extent of reaction.
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6. Which one is the excess reactant?
a) N2
b) H2
c) Both N2 and H2
d) Neither N2 nor H2

Explanation: H2 has higher extent of reaction.

7-10. For a given reaction reactor is supplied with a feed of composition 46% C3H7O4, 44% O2 and 10% N2 and if 50% of the limiting reagent conversion takes place.
4C3H7O4 + 11O2 → 12CO2 + 14H2O
7. What is the percentage of O2 in the product?
a) 10
b) 18
c) 38
d) 54

Explanation: Assume that 100 moles of feed is present in the reactor and do the material balance for each, Percentage of O2 = 18%.

8. What is the percentage of N2 in the product?
a) 8
b) 18
c) 34
d) 46

Explanation: Assume that 100 moles of feed is present in the reactor and do the material balance for each, Percentage of N2 = 8%.

9. What is the percentage of C3H7O4 in the product?
a) 10
b) 16
c) 31
d) 43

Explanation: Assume that 100 moles of feed is present in the reactor and do the material balance for each, Percentage of C3H7O4 = 31%.

10. What is the percentage of H2O in the product?
a) 15
b) 23
c) 39
d) 51

Explanation: Assume that 100 moles of feed is present in the reactor and do the material balance for each, Percentage of H2O = 23%.

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