Chemical Process Calculation Multiple Choice Questions & Answers (MCQs) focuses on “Mole and Molecular Weight-II”.
1-2. A vessel contains 4 lb of H2SO4.
1. How much pound mole of H2SO4 is there in the vessel?
a) 0.0408
b) 18.53
c) 0.0816
d) None of the mentioned
Answer: a
Clarification: lb mole = mass in lb/molecular weight.
2. How much gram mole of H2SO4 is there in the vessel?
a) 18.53
b) 0.0408
c) 18.53
d) None of the mentioned
Answer: a
Clarification: lb mole = mass in lb/molecular weight.
3. How many pounds of NaOH are in 15 g mole of NaOH?
a) 1.32
b) 2.64
c) 3.96
d) 5.28
Answer: a
Clarification: First convert 15 g mole of NaOH to grams of NaOH, and then use the conversion of 1 lb = 454g.
4. Mass of a compound per mole is _________
a) Mole
b) Molecular weight
c) Mole fraction
d) None of the mentioned
Answer: b
Clarification: Mass of a compound per mole is called Molecular weight.
5. A pseudo molecular weight computed by dividing the mass in a mixture or solution by the number of moles in the mixture or solution is called
a) Molecular weight
b) Average molecular weight
c) Atomic weight
d) None of the mentioned
Answer: b
Clarification: A pseudo molecular weight computed by dividing the mass in a mixture or solution by the number of moles in the mixture or solution is called average molecular weight.
6. The __________ of an element is the mass of an atom based on the scale that assigns a mass of exactly 12 to the carbon isotope 12C .
a) Molecular weight
b) Average molecular weight
c) Atomic weight
d) None of the mentioned
Answer: c
Clarification: The atomic weight of an element is the mass of an atom based on the scale that assigns a mass of exactly 12 to the carbon isotope 12C.
7. The molecular weight of a compound is nothing more than the sum of the weights of atoms of which it is composed.
The above given statement is
a) Correct
b) Incorrect
c) The definition should be more proper
d) None of the mentioned
Answer: a
Clarification: The molecular weight of a compound is nothing more than the sum of the weights of atoms of which it is composed.
8. How many molecules are there in 4*10-3 lb moles of carbon?
a) 12.044 *1023
b) 12.044 *1026
c) 12.044 *1029
d) 12.044 *1022
Answer: a
Clarification: 4*10-3 lb moles of C = 2 gm moles of C.
9. _____________ is the number of moles of a particular substance in a mixtures or solution divided by the total number of moles present in the mixture or solution.
a) Molecular weight
b) Average molecular weight
c) Atomic weight
d) Mole fraction
Answer: d
Clarification: Mole fraction is the number of moles of a particular substance in a mixtures or solution divided by the total number of moles present in the mixture or solution.
10. __________ is mass of a particular substance divided by the total mass of all the substances present in the mixture or solution.
a) Molecular weight
b) Weight fraction
c) Atomic weight
d) Mole fraction