Q15 / 90 · KVPY 2014 (SB/SX) · Chemistry

The density of acetic acid vapor at $300 \mathrm{~K}$ and $1 \mathrm{~atm}$ is $5 \mathrm{mg} \mathrm{cm}^{-3}$. The number of acetic acid molecules in the cluster that is formed in the gas phase is closest to

A
5
Correct answer
B
2
C
3
D
4

Solution

$d=\frac{P M}{R T} \quad M=\frac{d R T}{P}$ $M=123$ $\therefore$ acetic acid exist as dimer

Hence, the correct answer is option: 'B'.

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