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(D) The number of molecules is directly proportional to the number of moles $(n = 	ext{mass} / 	ext{molar mass})$.For $A$: $n(SO_2) = 64 \ g / 64 \

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$8 \ g \ H_2$

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(D) The number of molecules is directly proportional to the number of moles $(n = 	ext{mass} / 	ext{molar mass})$.For $A$: $n(SO_2) = 64 \ g / 64 \ g \ mol^{-1} = 1 \ mol$.For $B$: $n(CO_2) = 44 \ g / 44 \ g \ mol^{-1} = 1 \ mol$.For $C$: $n(O_3) = 48 \ g / 48 \ g \ mol^{-1} = 1 \ mol$.For $D$: $n(H_2) = 8 \ g / 2 \ g \ mol^{-1} = 4 \ mol$.Since $H_2$ has the highest number of moles $(4 \ mol)$,it contains the maximum number of molecules.

Which has the maximum number of molecules among the following?

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