$10\mathrm{.}4N{a}_{2}O*B_2{O}_3$ and $K_{2}O*B_2{O}_3$ form complete ranges of solid and liquid solutions

and the solidus and liquidus show a common minimum at the equimolar com$-$

position and $T=1123K.$ Calculate the molar Gibbs free energy of formation of

the equimolar solid solution from solid $N{a}_{2}O*B_2{O}_3$ at $1123K,$ assuming that the

liquid solutions are ideal.