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Question

A mixture of NO2 and N2O4 has a vapour density of 38.3 at 300K. What is the number of moles of NO2 in 100g of the mixture

A
0.437
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B
4.4
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C
3.4
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D
3.86
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Solution

The correct option is A 0.437

Effective Molecular Wt. of mixture = 2 × V.D. = 2 × 38.3 = 76.6
Let wt. of NO2 = x
So wt. of N2O4 = 100 - x
Hence, x46+100x92=10076.6=2x+100x92=10076.6
x = 20.10, no. of mole. of NO2 = 20.1046=0.437


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