For many purposes we can treat propane $(C_3{H}_8)$ as an ideal gas at temperatures above its boiling point of $-42.C.$

Suppose the temperature of a sample of propane gas is raised from $-19\mathrm{.}0C$ to $6\mathrm{.}0C,$ and at the same time the pressure is increased by $15\mathrm{.}0\%.$