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Q.

The number of molecules in 4.25 g of ammonia is

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a

0.5×1023

b

3.5×1023

c

1.5×1023

d

1.8×1032

answer is C.

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Detailed Solution

Molecular weight of NH3 is 17According to the mole concept17 g NH3 has molecules = 6.02 ×1023∴1gNH3 has molecules =6.02×102317∴4.25gNH3 has molecules =6.02×1023×4.2517=1.5×1023 molecule
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