問題詳情
11 質量為 50 克、溫度為 25℃的未知物質，於密閉容器中和質量為 20 克、溫度為-10℃相同的未知物質混合，達到熱平衡後的溫度為 5℃。已知該未知物質的熔點為 0℃，固態時其比熱為 1.0 卡/克℃，液態時其比熱為 0.5 卡/克℃。假設混合過程中無熱量損失，則此物質的熔化熱為何？
(A) 5.0 卡/克
(B) 7.5 卡/克
(C) 12.5 卡/克
(D) 15.0 卡/克
(A) 5.0 卡/克
(B) 7.5 卡/克
(C) 12.5 卡/克
(D) 15.0 卡/克
參考答案
無參考答案
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