本题目来源于试卷: Physics Unit14: Heat，类别为 通用国际物理
[单选题]
The heat of fusion of lead is 5.9 + a:yk9tlu)tn /kdpx,vk hf,4kbueij k9jdgu 8: pc1c67vgx9nsn 1,g9 cal/kg, and the heat of vaporization is 207 kcal/k j e9jk9 gc69sp71,dbx:1nvgiucn u8gg, and its melting point is $328 \; ^{\circ}C$. How much heat is required to melt 50 g of lead initially at $23 \; ^{\circ}C$? (The specific heat of lead is $0.031 \; kcal/kg \cdot ^{\circ}C$)
A. $678 \; cal$
B. $687 \; cal$
C. $768 \; cal$
D. $876 \; cal$
参考答案: C
本题详细解析:
暂无
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