Answer :
When the mass is the same, the number of molecules is inversely proportional to the molecular mass. This means less will be the molecular mass, more will be the number of molecules.
CO2 = 12 × 2 × 16 = 44u
N2 = 2× 14 = 28u
H2 = 2× 1 = 2u
CH4 = 12 + 4× 1 = 16u
Hence, 1 g H2 has maximum numbers of molecules.
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