Which one of the following is the lightest?

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(C) To find the lightest,we calculate the mass for each option:$1$. Mass of $0.2 \ mol$ of $H_2 = 0.2 \ mol 	imes 2 \ g/mol = 0.4 \ g$.$2$. $6.023

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$0.1 \ g$ of silver

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(C) To find the lightest,we calculate the mass for each option:$1$. Mass of $0.2 \ mol$ of $H_2 = 0.2 \ mol 	imes 2 \ g/mol = 0.4 \ g$.$2$. $6.023 	imes 10^{23}$ molecules of $N_2$ corresponds to $1 \ mol$. Mass of $1 \ mol$ of $N_2 = 1 \ mol 	imes 28 \ g/mol = 28 \ g$.$3$. Mass of $0.1 \ g$ of silver is given as $0.1 \ g$.$4$. Mass of $0.1 \ mol$ of $O_2 = 0.1 \ mol 	imes 32 \ g/mol = 3.2 \ g$.Comparing the masses: $0.1 \ g Therefore,$0.1 \ g$ of silver is the lightest.

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