The largest number of molecules are in:

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(A) To find the number of molecules,we calculate the number of moles for each substance using the formula: $n = \frac{	ext{mass}}{	ext{molar mass}}$

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$36 \ g \ H_2O$

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(A) To find the number of molecules,we calculate the number of moles for each substance using the formula: $n = \frac{	ext{mass}}{	ext{molar mass}}$.$A) \ 36 \ g \ H_2O: n = \frac{36}{18} = 2 \ 	ext{moles}$.$B) \ 28 \ g \ CO: n = \frac{28}{28} = 1 \ 	ext{mole}$.$C) \ 46 \ g \ C_2H_5OH: n = \frac{46}{46} = 1 \ 	ext{mole}$.$D) \ 54 \ g \ N_2O_5: n = \frac{54}{108} = 0.5 \ 	ext{moles}$.Since the number of molecules is directly proportional to the number of moles $(N = n 	imes N_A)$,the substance with the highest number of moles will have the largest number of molecules. Thus,$36 \ g \ H_2O$ contains the largest number of molecules.

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