作者ru18284 (夯哥)
看板ChemEng
标题[问题] 求解一题物化
时间Sun Dec 4 15:32:05 2011
One mole of an ideal gas with Cv,m = 5/2R undergoes the
transformations described in the follow list from
an initial state described by T=250K and P= 1 bar .
Calculate △S .
a. The gas undergoes an adiabatic expansion against a constant
external pressure of 0.5 bar untill the final pressure is half
its initial value .
既然是 ideal gas 那为什麽求解Tf(末温) 不能用 Pf/Pi = Tf/Ti 着手呢?!
必须用到q=0, △U = W 下去求得Tf呢??!
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◆ From: 112.104.18.49
1F：推 lucifer19:要使用Pf/Pi = Tf/Ti必须要定体积阿 140.129.43.146 12/04 18:52