Multiple choice

The vapour density of a mixture containing NO2 and N2O4 is 38.3 at 27°C. Calculate the moles of NO2 in 100 g of the mixture.

  1. 0.954

  2. 0.437

  3. 0.123

  4. 0.222

  5. 0.808
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B Correct answer
Explanation

Molecular mass of the mixture = 2 * 38.3 = 76.6 Let, mass of NO2 in 100 g of mixture = a g. Moles of NO2 + Moles of N2O4 = Moles of mixture i.e., (a / 46) + ((100 – a ) / 92) = (100 / 76.6) a = 30.1 g. Moles of NO2 in the mixture =( 20.1 / 46) = 0.437 (approx.). Hence, this is a correct option.

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