$*15\mathrm{.}15$ Write the expression for $K_c$ for the following reactions. In each case indicate whether the

reaction is homogeneous or heterogeneous.

a$.3NO(g)N_{2}O(g)+N{O}_2(g)$

d$.HF(aq)H^{+}(aq)+F^{-}(aq)$

e$.2Ag(s)+Z{n}^{2+}(aq)2A{g}^{+}(aq)+Zn(s)$

f$.H_{2}O(l)H^{+}(aq)+O{H}^{-}(aq)$

g$.2H_2{O}_2(l)2H_{2}O(l)+O_2(g)$