MCQ practice · SSC Chemistry Board questions · Chapter 3: Structure of Matter
What is the mass of one atom of Al in grams?
Think it through first, then pick an option.
- a 27
- b 4.482 × 10⁻²³
- c 1.66 × 10⁻²⁴
- d 3.16 × 10⁻²³
Answer and explanation
Correct answer: b 4.482 × 10⁻²³
The book: one Al atom has a mass of 4.482 × 10⁻²³ g.
Why the other options are wrong
- a 27: 27 is the relative atomic mass, with no unit; the mass in grams is 4.482 × 10⁻²³.
- c 1.66 × 10⁻²⁴: 1.66 × 10⁻²⁴ g is the mass of 1/12 of a carbon-12 atom, not of Al.
- d 3.16 × 10⁻²³: 3.16 × 10⁻²³ g is the mass of one fluorine atom, not aluminium.
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