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The vapour density of N2O4 at a given temperature is found to be 30. Calculate the percentage dissociation of N2O4 (into NO2) at this temperature.

1. 53.3%
2. 106.6%
3. 26.7%
4. None

Correct answer: 53.3%

Solution

The theoretical vapour density of N2O4 is 46; the observed value 30 reflects dissociation into 2 NO2. With alpha = (46-30)/((2-1)*30) = 16/30 = 0.533, the dissociation is 53.3%.

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