[問題] 一題熱力學問題

看板ChemEng作者 (12345)時間11年前 (2012/12/11 22:21), 編輯推噓1(103)
留言4則, 1人參與, 最新討論串2/2 (看更多)
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? -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 27.147.37.136

12/13 18:13, , 1F
我覺得沒錯欸 你的ΔS是熔化時的ΔS
12/13 18:13, 1F

12/13 18:14, , 2F
液態的金屬亂度都差不多 所以由本來較
12/13 18:14, 2F

12/13 18:14, , 3F
規則的FCC轉變為液體的亂度變化會大於
12/13 18:14, 3F

12/13 18:14, , 4F
BCC金屬固體變化為液體的亂度變化
12/13 18:14, 4F
文章代碼(AID): #1Gnq5JWB (ChemEng)
文章代碼(AID): #1Gnq5JWB (ChemEng)