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Problem set 1 Solutions

Problem set 1 Solutions - Problem set 1 Solutions 7.2 w...

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Problem set 1 Solutions 7.2 w = -P ext ΔV ΔV = V 2 -V 1 = 800-150 = 650 ml = 0.65 L w = -0.98 atm x 0.65 L = -0.64 L atm 1 L atm = 101.325 J, Therefore w = -65 J 7.10 (a). The battery performs work on the surroundings so w = -117.0 J. It also absorbs negative heat so q = -3.0 J. From the first law ΔE = -120.0 J. (b). Once the battery is recharged, the final stage is indistinguishable from the original state, so ΔE = 0. But ΔE overall = 0 = ΔE discharge + ΔE charge = (q+w) discharge + (q+w) charge 0 = -3.0 + (-117.0) + q charge + 210.0 Q charge = -90.0 J The battery evolves heat to the surroundings as it is charged.

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