Chemistry Questions and Answers – Atomic and Molecular Masses##ENJOYURLIFE.NET

TITRATION VIDEO.

This set of Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Atomic and Molecular Masses”.

1. As, per the current system, carbon-12 has been taken as the standard for measuring atomic masses.
a) True
b) False
View Answer

2. 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

3. What is the abbreviation of amu?
a) Atomic matter unit
b) Atomic mass unified
c) Atomic mass unit
d) At mass unity

4. Nowadays, “amu” is replaced by ____
a) u
b) g
c) kg
d) am
View Answer

5. Calculate the average atomic mass of nitrogen present in the atmosphere?

Check this: Class 12 – Chemistry MCQs | Class 11 – Chemistry Books

a) 14.007 amu
b) 15.001 amu
c) 14.000 amu
d) 14.0031 amu
View Answer

6. 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
View Answer

7. ______ 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
View Answer

8. What’s the molecular mass of carbon dioxide?
a) 43
b) 28
c) 44
d) 40

9. What’s the formula mass of NaCl?
a) 23 u
b) 35.5 u
c) 58 u
d) 58.5 u

10. Calculate the molecular mass of sucrose(C₁₂H₂₂O₁₁) molecule?
a) 342 amu
b) 343 amu
c) 341 amu
d) 340 amu