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massa zat = 400 gram = 0,4 kg
kalor jenis zat = 0,4 J / gram = 400 J / kg
perubahan suhu = 30 derajat C - 450 derajat C = -420 derajat C
Dit.
Joule kalor
Jwb.
Kalor = 0,4 kg X 400 J / kg X - 420 derajat C
= - 67200
= 67200 J