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Q.

$N_{2} O_{4}$ dissociates into ${NO}_{2}$ If % dissociation of $N_{2} O_{4}$ is 33.33 %, calculate average molecular weight of gaseous mixture formed.

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answer is 69.

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Detailed Solution

We have

$M_{eff} = \frac{M_{0}}{1 + α}$

$1 + \frac{1}{3} = \frac{92}{M_{a v g}}$

we get,

$M_{a v g} = 69$

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