作者mungdean (12345)
看板ChemEng
标题[问题] 一题热力学问题
时间Tue Dec 11 22:21:05 2012
According to Richard's rules that the heats of melting are
related to the melting points of metallic elements as follows:
ΔHm=9.61Tm +-0.01J/K/mole for FCC metallic elements
ΔHm=8.25Tm +-0.19J/K/mole for BCC metallic elements
compare the entropy of FCC and BCC metallic elements by observing
the above relations and enplain why
想请问一下这题该怎麽解释?? 不是应该堆积密度大的entropy比较小吗?
照题目来看ΔHm/Tm=ΔS 这样一来不就 FCC>BCC了?
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1F：推 lucifer19:我觉得没错欸 你的ΔS是熔化时的ΔS 140.120.135.23 12/13 18:13
2F：→ lucifer19:液态的金属乱度都差不多 所以由本来较 140.120.135.23 12/13 18:14
3F：→ lucifer19:规则的FCC转变为液体的乱度变化会大於 140.120.135.23 12/13 18:14
4F：→ lucifer19:BCC金属固体变化为液体的乱度变化 140.120.135.23 12/13 18:14