Q. 105.0( 2 Votes )

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

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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