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20點請問國二理化元素與化合物的問題

Jan 19th 2014, 10:42

這位大大您好
很高興能為您解答

溫度：0─────43(鐵與水熱平衡)───────────────────────?(鐵與磚窯熱平衡)
我們現在就是要求出那個問號
首先看到有關熱的題目
一定要立刻想到H=MSΔT
在鐵與水的平衡中
H=MSΔT(鐵)=MSΔT(水)
代數字之後就變成
50*0.12*(?-43)=400*(43-25)
?=1243
這樣算下來答案就是A了

如果有誤敬請各位批評指教
也希望我的回答對你有所幫助

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