A gaseous mixture consists of 75 % methane and 25 % ethane by mass. One million cubic feet of this mixture is trapped in a geological formation as natural gas at 300 degrees Fahrenheit and 2000 psia. This natural gas is pumped 6000 ft to the surface. At the surface, the gas pressure is 20 psia and its temperature is 200 degrees fahrenheit. Using Kay's rule and the enthalpy-departure charts, calculate the work required to pump this gas.