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20%N2O4 molecules are dissociated in a s...

`20%N_2O_4` molecules are dissociated in a sample of gas at `27^@C` and 760 mm hg .calculate the density of equilion mixture.

A

3.11 g/litre

B

2.11 g/litre

C

4.5 g/litre

D

None of these

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A
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