Answer
a) $K$ $=$ $[NO]^{2}$$/$$[N_{2}][O_{2}]^2$
b) $K$ $=$ $[NO_{2}]^{2}$$/$$[N_{2}O_{4}]$
c) $K$ $=$ $[SiCl_{4}][H_{2}]^{2}$$/$$[SiH_{4}][Cl_{2}]^{2}$
d) $K$ $=$ $[PCl_{3}]^{2}[Br_{2}]^{3}$$/$$[PBr_{3}]^{2}[Cl_{2}]^{3}$
Work Step by Step
note:
if aA + bB >>>> cC + dD
then equilibrium constant K = $[C]^{c}[D]^{d}$$/$$[A]^{a}[B]^{b}$
concentration of product over concentration of reactants
IMPORTANT: solids (s) and Liquids (l) are not included in the equilibrium expression
