Liquid isobulune is throttled through a valve from an initial state of 360 K and 4,000 kPla to a final pressure of 2,000 kPa. Estimate the temperature change and the entropv change of the isobutane. The specific heat of liquid isobutene at 360 K is 2.78 J g-1 oC-1. Estimates of V and ( may be found from Eq. (3.72).