NEET Questions Solved


Which has maximum number of molecules?

(a) 7g N

(b) 2g H

(c) 16g NO

(d) 16g O

(b) In 7g nitrogen, number of  molecules = 7.028mol = 0.25 x NA molecules

where, NA = Avogadro number = 6.023 x 1023

In 2g of H2= 2/2 mol =1x NA molecules

In 16 g of  NO2= 16/46 mol = 0.348 x NA molecules

In 16 g of O2 = 16/32 mol = 0.5 x NA molecules

Hence, maximum number of molecules are present in 2g of H2.

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