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(1) で、58℃の水250gができたはずですが

実際は、48℃の水250gができたので

失った熱量は、水250g、10Kで

 10[k]×250[g]×4.2[J/(g・k)]=10500[J]

補足
(1)(200×70+50×10)/(200+50)=58

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