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402 kJ = 402000 J
Q1 = m.c.deltaT
402000 = m.1000.670
402000 = 670000m
m = 402000/670000
m = 0,6 kg
m = 600 gram
Q2 = m.L
Q2 = 0,6.4x10pangkat 5
Q2 = 0,6 x 400000
Q2 = 240000 J
Q2 = 240 kJ