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209s10a7s

# 209s10a7s - DCGN209-Spring10 Homework#7 p 1 of 4 I Study...

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DCGN209-Spring’10: Homework#7 p. 1 of 4 I. Study Questions & Problems (not to hand in) . A. Exactly 1.2028 moles of He(g) initially exerts a pressure of 800 kPa at 26.85 0 C. The gas expands isothermally against a constant opposing pressure of 400.0 kPa to a final pressure of 400.0 kPa. 1. Exactly 1.2028 moles of H 2 O, initially solid at 0.00 0 C & 1.000 atm, is completely converted to liquid at 0.00 0 C & 1.000 atm. mole J H fus 6010 = 2. Exactly 1.2028 moles of H 2 O, initially liquid at 100.0 0 C & 1.000 atm, is completely converted to gas at 100.0 0 C & 1.000 atm. mole J H vap 670 , 40 = 3. Exactly 1.2028 moles of He(g) initially exerts a pressure of 800 kPa at 26.85 0 C. The gas expands adiabatically and reversibly to a final pressure of 400.0 kPa. Answers w b Q U H 1. ~0 +7229 J +7229 J +7229 J 2. +3732 J +48,918 J + 45,186 J +48,918 J 3. +1665 J 0 -1665 J -2775 J

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DCGN209-Spring’10: Homework#7 p. 2 of 4 B. For the following processes refer to an 1.2028 moles of Ar(g) – a monatomic ideal gas for which C V = 3/2R (per mole) = constant. In each case the initial conditions are the same: T 1 = 300.0 K & P 1 = 1000.0 kPa. Circle the correct answer for the sign

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209s10a7s - DCGN209-Spring10 Homework#7 p 1 of 4 I Study...

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