【比热容练习题想得到6kg50℃的温水,而把25℃的冷水和1-查字典问答网

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　　【比热容练习题想得到6kg50℃的温水,而把25℃的冷水和100℃的开水混合,问需用冷丶开水各多少?································································】

　　比热容练习题

　　想得到6kg50℃的温水,而把25℃的冷水和100℃的开水混合,问需用冷丶开水各多少?·········································································································

1回答

2020-06-22 22:49

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舒俊辉

　　设用xkg冷水,（6-x）kg热水

　　Q末=Cm10△t=4.2X10^3X6X50=1.26X10^6J

　　Q冷=Cx△t=x`1.05X10^5J

　　Q热=C（6-x）△t=(6-x)`4.2X10^5

　　Q热+Q冷=Q末

　　x=4kg

　　6-x=2kg

2020-06-22 22:52:03

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