作者mungdean (12345)
看板ChemEng
標題[問題] 一題熱力學問題
時間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
想請問一下這題該怎麼解釋?? 不是應該堆積密度大的entropy比較小嗎?
照題目來看ΔHm/Tm=ΔS 這樣一來不就 FCC>BCC了?
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1F：推 lucifer19:我覺得沒錯欸 你的ΔS是熔化時的ΔS 140.120.135.23 12/13 18:13
2F：→ lucifer19:液態的金屬亂度都差不多 所以由本來較 140.120.135.23 12/13 18:14
3F：→ lucifer19:規則的FCC轉變為液體的亂度變化會大於 140.120.135.23 12/13 18:14
4F：→ lucifer19:BCC金屬固體變化為液體的亂度變化 140.120.135.23 12/13 18:14