${K_C} = \frac{{{{[N{O_2}]}^2}}}{{[{N_2}{O_4}]}} = \frac{{{{(1.2 \times {{10}^{ - 2}})}^2}}}{{(4.8 \times {{10}^{ - 2}})}} = \frac{{1.2 \times 1.2 \times {{10}^{ - 4}}}}{{4.8 \times {{10}^{ - 2}}}} = 3 \times {10^{ - 3}}$
$2S{O_2} + {O_2}$ $\rightleftharpoons$ $2S{O_3} + Q$ $Cal$