=10dm3(为什么?)△H=0(为什么?))/ln()/d(2121ppnRppnRSpp?????1KJ29.84???1(δ/ ) 84.29J K 0S Q T?? ? ????1(δ/ ) 43.43J K 0S Q T?? ? ????(b)(a)δ/ 0S Q T? ? ??8例40.1MPa下的1mol双原子分子理想气体连续经历下列几步变化:(a)从25℃恒容加热到100℃;(b)向真空绝热膨胀至体积增大一倍;(c)恒压冷却到25℃;试求总的Q、W、ΔU、ΔH、ΔS。解:00????HU,112KJ763.5)/ln()/d()(21???????VVnRVVnRbSVV112-om,-om,KJ663.4)/ln()/d()(21???????TTnCTTnCaSVTTV112-om,-om,KJ529.6)/ln()/d()(21????????SpTTp??11KJ897.3KJ529.6763.5663.4?????????S112ln 3.895J KpS nRTp?? ? ??624JW Q Wa Wb Wc Wc p V??????????9解:0000??????QWHU,,,1OO2KJ676.2ln)/ln()O(22????????ynRppnRS1NN2KJ484.1ln)/ln()N(22????????ynRppnRS122KJ160.4)N()O(????????SSS??273.2 4.160 J 1136.7J 0A G T S? ???????????例5如图所示,两边气体均为0?C,0.1MPa,抽去隔板后,两气体均匀混合。求过程的Q、W、?U、?H、?S、?G。并判断可逆性。0.2molO20.8molN20.2 mol O20.8 mol N210
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