The system that contains the maximum number of atoms is: (A) 4.25 g of NH3 (B) 8 g of O2 (C) 2 g of H2 (D) 4 g of He

Number of atoms = (mass/molar mass) x NA x Number of atoms in one mole

Hence,

Number of atoms in 4.25 g

NH3 = (4.25/17) x NA x 4

= NA

Number of atoms in 8g

O2 = (8/32) x NA x 2

= NA/2

Number of atoms in 2g

H2 = (2/2) x NA x 2

= 2NA

Number of atoms in 4g

He = (4/4) x NA x 1

= NA

Therefore, among the given, 2g H2 contains the maximum number of atoms

So, the correct option is (C)

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