Question $19$

Consider a solution with components i and j$.$ The energies of molecular interactions between molecules ii$,$ jj$,$ and ij are respectively $1\mathrm{.}01,1\mathrm{.}47,$ and $1\mathrm{.}21$ eV$.$ Assuming a regular solution behavior, determine at what temperature this solution will become immiscible. Enter your result in oC$.$

Question $20.$ Continue considering the solution with components i and $j$ from

Q$19.$ Assume that the solution contains $0\mathrm{.}8$ moles of component $i$

and $1\mathrm{.}2$ moles of component $j$ at the temperature of $0C.$

Question$\mathrm{.}21$ Continuing with conditions set in Q$20.$ What are mole fractions of

components i and $j$ in liquids $1$ and $2$

Liquid $1$: $x_i=0\mathrm{.}05$;$x_j=0\mathrm{.}95$; Liquid $2$:$x_i=0\mathrm{.}95$;$x_j=0\mathrm{.}05$

Liquid $1$: $x_i=0\mathrm{.}12$;$x_j=0\mathrm{.}88$; Liquid $2$:$x_i=0\mathrm{.}18$;$x_j=0\mathrm{.}82$

Liquid $1$: $x_i=0\mathrm{.}231$;$x_j=0\mathrm{.}769$; Liquid $2$: $x_i=0\mathrm{.}769$;$x_j=0\mathrm{.}231$

Liquid $1$: $x_i=0\mathrm{.}134$;$x_j=0\mathrm{.}866$; Liquid $2$: $x_i=0\mathrm{.}866$;$x_j=0\mathrm{.}134$

Liquid $1$: $x_i=0\mathrm{.}4$;$x_j=0\mathrm{.}6$; Liquid $2$: does not exist