5) You work in an industry that contains a continuous flow of pressurized ethane. As part of the process, ethane flows through a capillary tube, which can be modeled like a valve (A throttling device). Ethane flows from upstream conditions of 313 K and 20 bars to a downstream pressure of 1 bar. What is the gas temperature of the downstream side of the throttling device? Use the van der Waals equation of state for this calculation.