a$)$ Write appropriate mathematical expression$/-$s that enables calculation of equilibrium constant $(K_p)$ for gas phase reaction

at $298$ K from tabulated thermodynamic data. Include an appropriate legend. $(2\mathrm{.}5$ marks, K&U $4\mathrm{.}1).$

b$)$ Calculate the equilibrium constant for the following reaction at $298K.$ Show the data which you started from and your

working, or attach a Python code showing the formulae which you used. $(3\mathrm{.}5$ marks, A&A $4\mathrm{.}3)$