Which of the following contains maximum number of molecules
(a) 1g of CO2
(b) 1g of N2
(c) 1g of H2
(d) 1g of CH4

AcademicChemistryNCERTClass 9

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.

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.

raja
Updated on 10-Oct-2022 13:30:05

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