$3.$LAST DIGIT IS $8$

Using experimental aNi vs xNi diagram in the liquid solution of ironnickel at $1600C.$

a$)$ Does dilute solution obey Henry's law or not? If yes, show the range on the diagram and calculate the Henry's activitiy coefficient of $Ni.$

b$)$ Does solution deviate positively or negatively from ideal solution? Comment on the bonding energies of $Fe-Fe$ and $Ni-Ni$ and $Fe-Ni.$

c$)$ Calculate activity of $Fe$ at $x_{Ni}=$ the range part $($a$)/$last digit.

d$)$ Calculate the molar Gibbs free energy of mixing and partial molar Gibbs free energy of mixing of $Li$ and $Pb$ at $x_{Ni}=0\mathrm{.}4/$last digit.