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# Which of the following contains maximum number of molecules

**(a)** 1g of CO_{2}

**(b)** 1g of N_{2}

**(c)** 1g of H_{2}

**(d)** 1g of CH_{4}

Correct Answer: (c) 1g of H2

Explanation: 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.

CO_{2} = 12 × 2 × 16 = 44u

N_{2} = 2 × 14 = 28u

H_{2} = 2 × 1 = 2u

CH_{4} = 12 + 4 × 1 = 16u

Hence, 1 g H_{2} has maximum numbers of molecules.

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