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1gの水の温度を1℃上昇させるのに  4.2J必要

だから、例えば
10gの水の温度を2℃上昇させるには 4.2×(10×2)J必要

この問題は
100gの水の温度を4℃上昇させるには 4.2×(100×4)J必要

4.2×(100×4)=4.2×400=1680J

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