Chemical and Ionic Equilibrium - Result Question 80
####24. One mole of $N _2 O _4(g)$ at $300 K$ is kept in a closed container under one atmosphere. It is heated to $600 K$ when $20 %$ by mass of $N _2 O _4(g)$ decomposes to $NO _2(g)$. The resultant pressure is
(1996, 1M)
(a) $1.2 atm$
(b) $2.4 atm$
(c) $2.0 atm$
(d) $1.0 atm$
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Solution:
$$ N _2 O _4 \rightleftharpoons 2 NO _2 $$
$$ \begin{array}{lccl} \text { At } 300 K: & 1.0 atm & 0 & \ \text { At } 600 K: & 2.0-0.40 & 0.80 \quad \text { Total pressure }=2.40 atm \end{array} $$
