本题目来源于试卷: Physics Unit14: Heat，类别为 国际高中通用物理
[单选题]
The heat of fusion of lead is 5.9+x9l 1czwcv 2zoizb52 kiyf00bkuc6z.:nnen sr*+ du3 cal/kg, and the heat of vaporization is 207 kcal/kg, and its meltinuc0+b *fk3y.nd u i0snz:e n6rg 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
| 
