作者EstLan (呆蓝)
看板Chemistry
标题Re: 问一题热力学相关的
时间Tue Oct 17 20:03:23 2006
※ 引述《conway4 (我的空姐女友!!)》之铭言：
: 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用在定压 A用在定体积
定压下平衡ΔG=0 定体积下平衡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"
: 这两题我都蛮疑惑的
因为W= -∫PdV
外界对系统做功要ΔV< 0
冰溶化体积变小!!
我是这样想的
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 218.165.132.31
1F：推 conway4:是d不算是外界给它热能吗? 10/18 01:00
2F：推 EstLan:作功与热同时都有呀 题目是问有没有作功的转移 所以选D 10/18 13:14