Answer :
Lewis-Randall rule : Lewis-Randall rule states that, the fugacity of a component is directly proportional to the mole fraction of the component in the solution in an ideal solution.
The equation used for the Lewis-Randall rule for fugacity of species in an ideal solution is :
[tex]f_i=X_i\times f_i^o[/tex]
where,
[tex]f_i[/tex] = fugacity in the solution
[tex]f_i^o[/tex] = fugacity of a pure component
[tex]X_1[/tex] = mole fraction of component
