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Among the following, which sample has the smallest mass?
A$6.023 \times 10^{23}$ atoms of He
B1 mole of He atoms
C2 g of He
D1 atom of He
Answer & Solution
Correct answer: D. 1 atom of He
1. Options A and B both describe one mole of helium, i.e. 4 g.
2. Option C is 2 g of helium, which is half a mole.
3. Option D is a single helium atom, with mass about 4 amu, far smaller than any gram-scale sample.
4. Therefore one atom of He has the smallest mass.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 7 Atoms and Molecules "Textbook Evaluation", p.109_
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