The largest number of molecules is in

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(A) To find the number of molecules,we use the formula: $	ext{Number of molecules} = \frac{	ext{Given mass}}{	ext{Molar mass}} 	imes N_A$.$(A)$ $3

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$34 \ g$ of water

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(A) To find the number of molecules,we use the formula: $	ext{Number of molecules} = \frac{	ext{Given mass}}{	ext{Molar mass}} 	imes N_A$.$(A)$ $34 \ g$ of $H_2O$ (Molar mass = $18 \ g/mol$): $\frac{34}{18} 	imes N_A \approx 1.89 	imes N_A$ molecules.$(B)$ $28 \ g$ of $CO_2$ (Molar mass = $44 \ g/mol$): $\frac{28}{44} 	imes N_A \approx 0.64 	imes N_A$ molecules.$(C)$ $46 \ g$ of $CH_3OH$ (Molar mass = $32 \ g/mol$): $\frac{46}{32} 	imes N_A \approx 1.44 	imes N_A$ molecules.$(D)$ $54 \ g$ of $N_2O_5$ (Molar mass = $108 \ g/mol$): $\frac{54}{108} 	imes N_A = 0.5 	imes N_A$ molecules.Comparing the values,$34 \ g$ of water contains the largest number of molecules.

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