9.18. 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)kg and its equation of state is P kgT/v - alv, where a is a positive constant. Find an terms of the initial temperature T and molar volume v1. Does the gas heat up or cool down due to throttling? expression for the final temperature T2 in

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