Question

which of the following has maximum number of atoms ?
(a)18g of H2O
(b)18g of O2
(c)18g of CO2
(d)18g of CH4​

Answer 1

Answer:

18g of o2 has maximum number of atoms because of sigma bonds between them and an covalent bond

Answer 2

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.