Balance the chemical equations: 4) Ag + H2S → Ag2S + H2 5) CH4 + O2 → CO2 + H2O 6) HgO → Hg + O2 7) Co + H2O → Co2O3 + H2

Amixture initially contains a, b, and c in the following concentrations: [a] = 0.300 m , [b] = 1.05 m , and [c] = 0.550 m . the following reaction occurs and equilibrium is established: a+2b⇌c at equilibrium, [a] = 0.140 m and [c] = 0.710 m . calculate the value of the equilibrium constant, kc.