Which one of the following is the lightest?

0.2 m o l e

of hydrogen gas

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6.023 \times 10^{23}

molecules of nitrogen

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0.1 g

of silver

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0.1 m o l e

of oxygen gas

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Solution

The correct option is C $0.1 g$ of silver
(a) Mass of H₂=moles×molar mass=0.2×2=0.4 g

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