[學科] 求解一題物化
請問各位大大一個小問題
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 .
我的問題是..
既然是 ideal gas 那為什麼求解Tf(末溫) 不能用 Pf/Pi = Tf/Ti 著手呢?!
必須用到q=0, △U = W 下去求得Tf呢??!
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