Which one of the following is the lightest? (a) \( 0.2 \) mole of hydrogen gas (b) \( 6.023 \tim...

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Which one of the following is the lightest?
(a) \( 0.2 \) mole of hydrogen gas
(b) \( 6.023 \times 10^{22} \) molecules of nitrogen
(c) \( 0.1 \mathrm{~g} \) of silver
(d) \( 0.1 \) mole of oxygen gas
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