Question

The vapour density of a mixture consisting of NO2 and N2O4 is 38.3 at 26.7°C.

Calculate the number of moles of NO2 in 100 gram of mixture.

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Answer 1

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Answer 2

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Let us assume that there are x moles of NO2 in the mixture. Hence, there will be (100-x) moles of N2O4 in the mixture (since total number of moles is 100).

We know that 1 mole of NO2 weighs 46g (14 + 2*16) and

1 mole of N2O4 weighs 92g (2*14 + 4*16)

Total molecular mass of the mixture = x*46 + (100-x)92

We also know that Molecular mass = 2 * Vapour density

= 2 * 38.3

= 76.6g

Molar mass of mixture = Mass of mixture / (Number of moles of NO2 + Number of moles of N2O4)

Molar mass of mixture = Mass of mixture / (x + 100 –x)

Therefore, (46x + (100-x)92)/100 = 76.6

46x + 9200 – 92x = 7660

46x = 1540

Therefore, x = 33.48 moles. i.e., 33.48 moles of NO2 are present in the mixture.

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