Consider the pure and multicomponent systems. Differentiate the following:

a$)$ Temperature and critical temperature

b$)$ Pressure, saturated pressure $($vapour pressure$)$ and critical pressure

c$)$ Gibbs energy and Chemical potential

d$)$ Chemical potential and fugacity

e$)$ Gibbs energy and residual Gibbs energy

f$)$ Change in enthalpy

g$)$ Change in Gibbs energy

h$)$ Change in chemical potential

i$)$ Change in fugacity

j$)$ Change in fugacity coefficient