250+ TOP MCQs on Mole and Molecular Weight – VIII and Answers

Chemical Process Calculation Questions and Answers for freshers focuses on “Mole and Molecular Weight-VIII”.

1-10. A cylinder contains 8 gms of He, 40 gms of Ne and 80 gms of Ar. (Molecular weights of the components are 4, 20 and 40 respectively)
1. How many moles of He are there in the cylinder?
a) 1
b) 2
c) 4
d) 6
Answer: b
Clarification: Number of moles = mass / molecular weight.

2. How many moles of Ne are there in the cylinder?
a) 1
b) 2
c) 4
d) 6
Answer: b
Clarification: Number of moles = mass / molecular weight.

3. How many moles of Ar are there in the cylinder?
a) 1
b) 2
c) 4
d) 6
Answer: a
Clarification: Number of moles = mass / molecular weight.

4. What is the mole fraction of He?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
Answer: b
Clarification: Mole fraction = Moles of the component / Total moles.

5. What is the mole fraction of Ne?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
Answer: b
Clarification: Mole fraction = Moles of the component / Total moles.

6. What is the mole fraction of Ar?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
Answer: a
Clarification: Mole fraction = Moles of the component / Total moles.

7. What is weight percentage of He?
a) 0.0225
b) 0.0425
c) 0.0625
d) 0.0825
Answer: c
Clarification: Weight percentage = mass of the component / Total mass.

8. What is weight percentage of Ne?
a) 0.3125
b) 0.4125
c) 0.5125
d) 0.6125