Chemical equilibrium

Exercise 12

    

Write the expression of constant $K$ for the equilibrium: $2H_2O_2(g)$ $2H_2O(l)$ $+$ $O_2(g)$ $ZnO(s)$ $+ $ $CO(g)$ $Zn(s)$ $+$ $CO_2(g)$ $AgCl(s)$ $+$ $Br^-(aq)$ $AgBr(s)$ $+$ $Cl^-(aq)$ $CuSO_4\cdot5H_2O(s)$ $CuSO_4(s)$ $+$ $5H_2O(g)$

    

$K$ $ =$ $\frac{[O_2]}{[H_2O_2]^2}$ $K$ $=$ $\frac{[CO_2]}{[CO]}$ $K$ $=$ $\frac{[Cl^-]}{[Br^-]}$ $K$ $=$ $[H_2O]$If $[H_2O]^5$ is constant, $[H_2O]$ will be constant too.