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Which of the following has maximum numbers of atoms?

A. 18 g of H2O

B. 18 g of O2

C. 18 g of CO2

D. 18 g of CH4

1 Answer

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Best answer

When the mass is same, the number of atoms is inversely proportional to the molecular mass. This means less will be the molecular mass, more will be the number of atoms.

H2O = 2× 1 + 16 = 18u

O2 = 2× 16 = 32u

CO2 = 12 × 2 × 16 = 44u

CH4 = 12 + 4× 1 = 16u

Hence, 18 g of CH4 has maximum numbers of atoms.

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