Exam 1 Review Equations

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Practice Exam 1 Solution Problem 1 October 4, 2015 Ideal Gas Expansion (a) Irreversible Expansion First calculate the nal volumes at each step using the ideal gas law. T = 923 K, n = 1 mole, and R = 8.314 J/molK 100 atm · V 1 = 1 mol · 8 . 314 J/molK · 1 Latm 100 J · 923 K V 1 = 0 . 767 L 50 atm · V 2 = 1 mol · 8 . 314 J/molK · 1 Latm 100 J · 923 K V 2 = 1 . 53 L 20 atm · V 3 = 1 mol · 8 . 314 J/molK · 1 Latm 100 J · 923 K V 3 = 3 . 84 L 1 atm · V 4 = 1 mol · 8 . 314 J/molK · 1 Latm 100 J · 923 K V 4 = 76 . 7 L To calculate work we use w = - ´ V 2 V 1 P ext dV Step 1: w = - P ext · ( V 2 - V 1 ) = - 50 atm · (1 . 53 L - 0 . 767 L ) = - 38 . 15 Latm = - 3 . 8 kJ Step 2:
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