This set of Chemical Process Calculation Questions and Answers focuses on “Mole and Molecular Weight-VII”.
1. A bucket contains 56 g of C2H4. What is the number of moles of C2H4 present in the bucket?
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 56 / 28 = 2.
2. A bucket contains 36 g of H2O. What is the number of moles of H2O present in the bucket?
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 36 / 18 = 2.
3. A bucket contains 44 g of C3H8. What is the number of moles of C3H8 present in the bucket?
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Number of moles = mass / molecular weight = 44 / 44 = 1.
4. A bucket contains 2 moles of H2O. How many moles of oxygen atoms are there in the bucket?
a) 1
b) 2
c) 4
d) 6
View Answer
Explanation: Each molecule of H2O contains one oxygen atom, so the moles of oxygen atoms = moles of H2O = 2.
5. A bucket contains 2 moles of C2H4, 2 moles of H2O, and 1 mole of C3H8. What is the total number of moles of hydrogen atoms present in the bucket?
a) 3
b) 6
c) 10
d) 12
View Answer
Explanation: Total moles of hydrogen atoms = 4 (from C2H4) + 4 (from H2O) + 8 (from C3H8) = 10.
6. In a mixture with 2 moles of C2H4, 2 moles of H2O, and 1 mole of C3H8, what is the mole fraction of C2H4?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = moles of C2H4 / total moles = 2 / (2 + 2 + 1) = 2 / 5 = 0.4.
7. In a mixture with 2 moles of C2H4, 2 moles of H2O, and 1 mole of C3H8, what is the mole fraction of H2O?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = moles of H2O / total moles = 2 / (2 + 2 + 1) = 2 / 5 = 0.4.
8. In a mixture with 2 moles of C2H4, 2 moles of H2O, and 1 mole of C3H8, what is the mole fraction of C3H8?
a) 0.2
b) 0.4
c) 0.6
d) 0.8
View Answer
Explanation: Mole fraction = moles of C3H8 / total moles = 1 / (2 + 2 + 1) = 1 / 5 = 0.2.
9. A bucket contains 56 g of C2H4, with a total mass of all components equal to 136 g. What is the weight percentage of C2H4 in the bucket?
a) 41.17
b) 51.17
c) 61.17
d) 71.17
View Answer
Explanation: Weight percentage = (mass of C2H4 / total mass) × 100 = (56 / 136) × 100 ≈ 41.17.
10. A bucket contains 36 g of H2O, with a total mass of all components equal to 136 g. What is the weight percentage of H2O in the bucket?
a) 26.47
b) 36.47
c) 47.47
d) 58.47
View Answer
Explanation: Weight percentage = (mass of H2O / total mass) × 100 = (36 / 136) × 100 ≈ 26.47.
Sanfoundry Global Education & Learning Series – Chemical Process Calculation.
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