$A_{(g)}+B_{(g)}=A{B}_{(g)}$ :

At $25C{K}_c=1,8{10}^3\frac{L}{\text{m}\text{o}\text{l}}$ and at $40C{K}_c=3\mathrm{.}45{10}^3\frac{L}{\text{m}\text{o}\text{l}}$

a$)H^o=?$

b$)S$ at $40$C $=?(H$ is assumed to be independent from temperature$).$

c$)$ Calculate $K_p$ at $25$C$.$

d$)$ Find standard free energy change.