A tank contains 2 m³ of a gas which is 70% methane, 25% ethane, and 5% nitrogen by volume. The mixture is at 20 °C and 25.66 atm, the average molar mass of the gas is 20.1 kg/kmol (R=0.082 m³.atm/kmol.K) Component Tc, K Pc, atm CH4 190.6 45.4 0.008 C2H6 305.4 48.2 0.098 N2 126.2 33.5 0.040 What is the mass of mixture in the tank? 45.6 kg 85.8 kg 126.0 kg 166.2 kg

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