ch20-p038 - 38. (a) Eq. 20-15 provides KC = QL QH QL QH =...

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38. (a) Eq. 20-15 provides L HL 1 C C C Q K KQ Q QQ K §· + = ¡ = ¨¸ ©¹ which yields | Q H | = 49 kJ when K C = 5.7 and | Q L | = 42 kJ. (b) From §20-5 we obtain 49.4 kJ 42.0 kJ 7.4 kJ WQ Q = =−= if we take the initial 42 kJ datum to be accurate to three figures. The given temperatures are not used in the calculation; in fact, it is possible that the given room temperature
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