The largest number of molecules is in

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(C) The number of molecules in a sample is calculated as: $	ext{Number of molecules} = \frac{	ext{Given mass } (W)}{	ext{Molar mass } (M)} 	imes N

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$36 \ g$ of $H_2O$

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(C) The number of molecules in a sample is calculated as: $	ext{Number of molecules} = \frac{	ext{Given mass } (W)}{	ext{Molar mass } (M)} 	imes N_A$,where $N_A$ is Avogadro's number.$A$: For $25 \ g$ of $CO_2$ $(M = 44 \ g/mol)$: $\frac{25}{44} 	imes N_A \approx 0.568 \ N_A$$B$: For $46 \ g$ of $C_2H_5OH$ $(M = 46 \ g/mol)$: $\frac{46}{46} 	imes N_A = 1 \ N_A$$C$: For $36 \ g$ of $H_2O$ $(M = 18 \ g/mol)$: $\frac{36}{18} 	imes N_A = 2 \ N_A$$D$: For $54 \ g$ of $N_2O_5$ $(M = 108 \ g/mol)$: $\frac{54}{108} 	imes N_A = 0.5 \ N_A$Comparing the values,$36 \ g$ of $H_2O$ contains the largest number of molecules.

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