A binary system A$-$B exhibits a miscibility gap, which is symmetric around xB$=0\mathrm{.}5,$ and may be described by using the regular solution model. The interaction parameter $\backslash$Omega is $40$ kJ$/$mol$.$ A sample with xA$=0,5$ is annealed at unknown temperature. The analysis of a cross sections shows that demixing has occoured. The compositions of the demixed phases $\backslash$alpha $1$ and $\backslash$alpha $2$ are xA$,\backslash$alpha $1=0\mathrm{.}05$ and xA$,\backslash$alpha $2=0\mathrm{.}95.$ Determine the annealing temperature! Temperature should be $1200$ C$.$ Please show how this was calculated.