Methane enters a process at T = 300°F and P = 1 atm, and is heated and compressed to T = 400°F and P = 5 atm. Find the change in molar Gibbs free energy for the methane, using Figure 7-1.

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FIGURE 7-1 Thermodynamic properties of methane. Pressure, psia 200 10,000 7000 17 5000 3000 2000 1000 27 5 32 One 100 150 400 MALA 600 200 250 300 800 350 Enthalpy, kJ/kg 1000 400 450 Enthalpy, Btu/lb, 1200 1+12 Lehek 500 550 1400 1600 1802 650 600 SEENE ४ ४ ४ ४ 215 NW 700 740 0.01 Pressure, MPa