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Atomic and Molecular Masses MCQs
1. Nowadays, “amu” is replaced by ____
a) u
b) g
c) kg
d) am
Answer: u
2. A sample of carbon that contains 70% carbon-12 and 30% carbon-14. What do you think is the average atomic mass of this sample?
a) 14.5
b) 14.14
c) 14
d) 12
Answer: 14
3. ______ is the sum of atomic masses of the elements present in a molecule.
a) Average atomic mass
b) Atomic mass
c) Gram formula mass
d) Molecular mass
Answer: Molecular mass
4. What’s the molecular mass of carbon dioxide?
a) 43
b) 28
c) 44
d) 40
Answer: 44
5. What’s the formula mass of NaCl?
a) 23 u
b) 35.5 u
c) 58 u
d) 58.5 u
Answer: 58.5 u
6. Calculate the molecular mass of sucrose(C12H22O11) molecule?
a) 342 amu
b) 343 amu
c) 341 amu
d) 340 amu
Answer: 342 amu
7. As, per the current system, carbon-12 has been taken as the standard for measuring atomic masses.
a) True
b) False
Answer: True
8. What is the mass of hydrogen in terms of amu?
a) 1.0020 amu
b) 1.0180 amu
c) 1.0070 amu
d) 1.0080 amu
Answer: 1.0080 amu
9. What is the abbreviation of amu?
a) Atomic matter unit
b) Atomic mass unified
c) Atomic mass unit
d) At mass unity
Answer: Atomic mass unit