In a continuous-flow process, a gas is throttled to half its density. the throttling is well described as a constant-enthalpy process. the constant-volume heat capacity of the gas is approximately (5/2)kb and its equation of state is p-kbt/-a/ where a is a positive constant. find an expression for the final temperature t2 in terms of the initial temperature ti and molar volume vi. does the gas heat up or cool down due to throttling?