This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Species Mole Balances-I”.
1. Given the reaction: C2H6 + Cl2 → C2H5Cl + HCl
If the feed composition is 50% C2H6, 40% Cl2, and 10% N2, and the percentage conversion of the limiting reactant is 60%, what is the mole percent of C2H6 in the product?
a) 24
b) 26
c) 40
d) 60
View Answer
Explanation: Assuming 100 moles of feed, with 60% conversion of the limiting reactant (Cl2), 24 moles of C2H6 will react, leaving 26 moles of C2H6. Therefore, the mole percent of C2H6 in the product is 26%.
2. Given the reaction: C2H6 + Cl2 → C2H5Cl + HCl
If the feed composition is 50% C2H6, 40% Cl2, and 10% N2, and the percentage conversion of the limiting reactant is 60%, what is the mole percent of Cl2 in the product?
a) 16
b) 24
c) 26
d) 40
View Answer
Explanation: Since 24 moles of Cl2 react, the remaining moles of Cl2 are 16, which corresponds to 16% of the total product.
3. Given the reaction: C2H6 + Cl2 → C2H5Cl + HCl
If the feed composition is 50% C2H6, 40% Cl2, and 10% N2, and the percentage conversion of the limiting reactant is 60%, what is the mole percent of C2H5Cl in the product?
a) 16
b) 24
c) 26
d) 40
View Answer
Explanation: 24 moles of C2H5Cl are produced, which is 24% of the total product.
4. Given the reaction: C2H6 + Cl2 → C2H5Cl + HCl
If the feed composition is 50% C2H6, 40% Cl2, and 10% N2, and the percentage conversion of the limiting reactant is 60%, what is the mole percent of HCl in the product?
a) 16
b) 24
c) 26
d) 40
View Answer
Explanation: 24 moles of HCl are produced, which is 24% of the total product.
5. Given the reaction: C2H6 + Cl2 → C2H5Cl + HCl
If the feed composition is 50% C2H6, 40% Cl2, and 10% N2, and the percentage conversion of the limiting reactant is 60%, what is the mole percent of N2 in the product?
a) 10
b) 16
c) 24
d) 40
View Answer
Explanation: N2 is inert and does not react, so it remains at 10% in the product.
6. In a bioreactor, glucose undergoes fermentation according to the following reaction: C6H12O6 → 2 C2H5OH + 2 CO2. A tank is initially charged with 6000 kg of a 15% glucose solution. After fermentation, 160 kg of CO2 is produced, and 100 kg of unreacted glucose is left. How much water is there in the tank after fermentation?
a) 94.45 kg
b) 5100 kg
c) 5194.45 kg
d) None of the mentioned
View Answer
Explanation: The initial water content is calculated by subtracting the mass of glucose from the total solution mass. After fermentation, the water content remains unchanged, as it is not involved in the reaction.
7. In a bioreactor, glucose undergoes fermentation according to the following reaction: C6H12O6 → 2 C2H5OH + 2 CO2. If 160 kg of CO2 is produced and 100 kg of unreacted glucose remains, how many moles of C6H12O6 reacted in the reaction?
a) 1.414
b) 1.818
c) 2.424
d) 4.848
View Answer
Explanation: The amount of glucose reacted can be determined by the stoichiometric relationship between glucose and CO2, and converting the mass of glucose to moles.
8. In a bioreactor, glucose undergoes fermentation according to the following reaction: C6H12O6 → 2 C2H5OH + 2 CO2. How much ethanol is there in the product, in kilograms, after fermentation?
a) 67.43
b) 167.43
c) 267.43
d) 367.43
View Answer
Explanation: Using stoichiometry, calculate the moles of ethanol produced and convert that to mass using its molar mass.
9. In a bioreactor, glucose undergoes fermentation according to the following reaction: C6H12O6 → 2 C2H5OH + 2 CO2. How much acetic acid (propenoic acid) is there in the product, in kilograms, after fermentation?
a) 178
b) 278
c) 378
d) 478
View Answer
Explanation: Acetic acid is produced in a secondary reaction. The amount is based on the stoichiometry of that reaction.
10. In a bioreactor, glucose undergoes fermentation according to the following reaction: C6H12O6 → 2 C2H5OH + 2 CO2. How much glucose is used in the second reaction that produces acetic acid?
a) 127.54
b) 227.54
c) 327.54
d) 427.54
View Answer
Explanation: Use stoichiometric relationships to determine how much glucose is involved in the secondary reaction leading to acetic acid.
Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
To practice all areas of Chemical Process Calculation, here is complete set of 1000+ Multiple Choice Questions and Answers.
