$(b)$ $O_2$ નું સક્રિયદળ $= $$\,\,\frac{{{\text{8}}{\text{.0}}\,}}{{{\text{32}}\,\, \times \,\,{\text{1}}}}\,\, = \,\,\frac{1}{4}\,\, = \,\,0.25\,\,g\,mole\,\,/\,\,litre$ $(O_2$ નો અણુભાર $=32)$
$(c)$ $NH_3$ નું સક્રિયદળ $= $$\,\,\frac{{{\text{34}}{\text{.0}}\,}}{{17 \times \,\,{\text{1}}}}\,\, = \,\,2.0\,\,g\,mole\,\,/\,\,litre\,$ $(NH_3$ નો અણુભાર $=17)$
$II: C + D $ $\rightleftharpoons$ $ 3A ; K_{eq}= K_2, $
$III: 6B + D $ $\rightleftharpoons$ $2C; K_{eq} = K_3$ જેથી,