A $2L$ tank is filled with $500\mathrm{.}0g$ propane. The contents consist of liquid and vapor at $41C.$

a$)$ Apply Gibbs phase rule to determine the numbers of degrees of freedom for the system.

b$)$ Calculate the pressure inside the tank?

c$)$ Calculate the specific molar volumes of vapor and liquid.

Additional information: $Pc=42\mathrm{.}0$atm,$Tc=369\mathrm{.}9K,MW=44\mathrm{.}09\frac{g}{m}ol$