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## Homework Statement

The vapour density of a sample of N2O4 gas is 35. What per cent of N2O4 molecules are dissociated inNO2?

## Homework Equations

molar mass = 2 * Vapour Density

## The Attempt at a Solution

I tried to solve this question this way,

Let the initial number of moles of N2O4=a

and, assume that the degree of dissociation is α

So,the reaction would be

N2O4 ---------> 2NO2

a ---------------0 (Before Dissociation)

a(1-α)------------2aα (After-dissociation)

And also since VD of N2O4 gas is 35. So,the mass of N2O4 gas would be=35*2=70.

But i do not know what i shall do next?

I will be thankful for any help!