$(30)$ Using Ellingham diagram,

a$)$ Find equilibrium partial pressure of oxygen for $Ca\frac{s}{C}aO(s)$ at $700K.$ Calculate KR$.$

What does happen above and below equilibrium partial pressure of oxygen?

b$)$ Retermine the standard molar enthalpx and entropx of formation$\_$and

$\backslash$Delta S$\_(298$K$)^(0)$ frem the Ellingham diagram.

c$)$ Gompare them $($part c$)$ with the $\backslash$Delta $H^{{?}^{{?}^{?}}}(0)$ and $\backslash$Delta $S^{{?}^{{?}^{?}}}(o)$ calculated in the question $2$a$.$