The fugacity of species $$ in a binary mixture of $$ and $$ at T $=300$ K and P $=40$ kPa is shown below. Use Henry$$s law as the reference state for component $$ and use the Lewis$/$Randall reference state for component $.$

a$)$ What is Henry$$s Law constant for species $?$

b$)$ What is the activity coefficient for species $$ at $=0\mathrm{.}4?($Remember to use the Henry$$s Law reference state!$)$

c$)$ Is the a$-$b interaction stronger than the self$-$interactions in this binary mixture? Explain.$$

d$)$ Assume the vapor phase is ideal. What is $$ya for the

vapor in equilibrium with the liquid solution containing $40\%$ species $$a$?$