250+ TOP MCQs on Material Balances -IV and Answers

Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Material Balances -IV”.

1- 4. For the given problem

1. What is the mass fraction for H2O in feed and NaOH in product?
a) 0.50 and 0.50
b) 0.65 and 0.50
c) 0.65 and 0.65
d) 0.50 and 0.95
Answer: b
Clarification: ΣωI = 1.

2. What is the mass in kg of H2O in feed and NaOH in product?
a) 65 and 50
b) 95 and 50
c) 65 and 75
d) 50 and 50
Answer: c
Clarification: ΣωI = 1 and mi= ωIW.

3. What is the mass fraction of NaOH in A?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
Answer: d
Clarification: ΣωI = 1 and ΣωIWi = 0 for each component.

4. What is the mass fraction of H2O in A?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
Answer: a
Clarification: ΣωI = 1 and ΣωIWi = 0 for each component.

5-7. Tank A contains 90% O2 that is mixed with another tank B containing 30% of O2 to get a Tank C containing 65% O2 .
5. What is the ratio of the gas used from Tank A to that used from Tank B?
a) 1.0
b) 1.2
c) 1.4
d) 1.6
Answer: c
Clarification: Σxi = 1.

6. If A = 100 moles, what are the number of moles of B?
a) 51.4
b) 61.4
c) 71.4
d) 81.6
Answer: c
Clarification: Σxi = 1.

7. If A = 100 moles, what are the number of moles of C?
a) 151.4
b) 161.4
c) 171.4
d) 181.6