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露西

铁虫 (小有名气)

[求助] 求助

1moI苯在一个大气压下,于沸点蒸发,试计 算: 1)体系的熵变;(o环境的

熵变;(3)整体的熵变;←)将蒸发 的苯体积压缩为原来的三分之一, 产生

的熵变是多少?已知: Tb苯 =353K,〈 苯 ,蒸发焓=30.8
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忠辉爵士

木虫 (正式写手)

【答案】应助回帖

感谢参与,应助指数 +1
该温度下蒸发本来是可逆过程,因此△S=△Hvap/Tb,△S环境=-△Hvap/Tb,△S总=0
体积压缩,则以恒温可逆压缩计算,该过程的dqr=-dW(恒温,内能不变)=pdV=nRTdV/V
dS=dqr/T=nRdV/V,故△S=∫(V到V/3)nRdV/V=nRln(1/3)
2楼2013-10-18 20:16:33
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