作者EstLan (呆藍)
看板Chemistry
標題Re: 問一題熱力學相關的
時間Tue Oct 17 20:03:23 2006
※ 引述《conway4 (我的空姐女友!!)》之銘言：
: a rxn is at equilibrium in a closed rigid vessel at constant T when
: a.ΔS=0
: b.ΔH=0
: c.ΔU=0
: d.ΔG=0
: e.ΔA=0
: the ans is "e" ???
G用在定壓 A用在定體積
定壓下平衡ΔG=0 定體積下平衡ΔA=0
: another one.......
: in which of the following processes is energytransferred into the
: substance by work(W>0)
: a.expansion of a gas against the surroundings
: b.expansion of a gas into a vacuum
: c.vaporization of one mole of water at 50度c in an open container
: d.melting of 100g of ice on a laboratory benchtop
: e.combustion of methane in a constant-V container
: the ans in this one is "d"
: 這兩題我都蠻疑惑的
因為W= -∫PdV
外界對系統做功要ΔV< 0
冰溶化體積變小!!
我是這樣想的
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1F：推 conway4:是d不算是外界給它熱能嗎? 10/18 01:00
2F：推 EstLan:作功與熱同時都有呀 題目是問有沒有作功的轉移 所以選D 10/18 13:14