This set of Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Mole and Molecular Weight-VIII”.
1. How many moles of helium (He) are present if a cylinder contains 8 grams of He? (Given: Molecular weight of He = 4)
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 8 / 4 = 2.
2. How many moles of neon (Ne) are present if a cylinder contains 40 grams of Ne? (Given: Molecular weight of Ne = 20)
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 40 / 20 = 2.
3. How many moles of argon (Ar) are present if a cylinder contains 80 grams of Ar? (Given: Molecular weight of Ar = 40)
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 80 / 40 = 2.
4. If a cylinder contains 2 moles of helium (He), 2 moles of neon (Ne), and 1 mole of argon (Ar), what is the mole fraction of helium?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = Moles of He / Total moles = 2 / (2 + 2 + 1) = 0.4.
5. If a mixture contains 2 moles of helium (He), 2 moles of neon (Ne), and 1 mole of argon (Ar), what is the mole fraction of neon?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = Moles of Ne / Total moles = 2 / (2 + 2 + 1) = 0.4.
6. If a gas mixture contains 1 mole of argon (Ar) among a total of 5 moles in the mixture, what is the mole fraction of argon?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = Moles of Ar / Total moles = 1 / 5 = 0.2.
7. What is the weight percentage of helium (He) in a mixture if the cylinder contains 8 grams of He and the total mass of the gas mixture is 128 grams?
a) 0.0225
b) 0.0425
c) 0.0625
d) 0.0825
View Answer
Explanation: Weight percentage = (mass of He / Total mass) = 8 / 128 = 0.0625.
8. What is the weight percentage of neon (Ne) if a cylinder contains 40 grams of Ne and the total mass of the gas mixture is 128 grams?
a) 0.3125
b) 0.4125
c) 0.5125
d) 0.6125
View Answer
Explanation: Weight percentage = (mass of Ne / Total mass) = 40 / 128 = 0.3125.
9. What is the weight percentage of argon (Ar) in a gas mixture where the cylinder contains 80 grams of Ar, and the total mass is 128 grams?
a) 0.225
b) 0.425
c) 0.625
d) 0.825
View Answer
Explanation: Weight percentage = (mass of Ar / Total mass) = 80 / 128 = 0.625.
10. Which of the following best describes helium (He), neon (Ne), and argon (Ar)?
a) Inert gas
b) Reactive gas
c) Ideal gas
d) None of the mentioned
View Answer
Explanation: Helium, neon, and argon are noble gases, known for being chemically inert.
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.
