A mixture of 80.0% methane and 20.0% ethane on a molar basis is contained in an insulated 1.00 m3 tank at 3.00 MPa and 50.0°C. An automatic flow control valve opens, causing the tank pressure to drop quickly to 2.00 MPa before it closes again.
a. Calculate the mass that escaped from the tank using Kay's law.
b. Determine the equilibrium tank temperature when the control valve closes, assuming that the gas remaining in the tank underwent a reversible process.