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Q = 84 kJ = 84000 J
T1 = 30°C
c = 4200 J/kg°C
Q = 84000
m . c . ΔT = 84000
0,5 . 4200 . (T2 - 30) = 84000
2100 . (T2 - 30) = 84000
T2 - 30 = 84000 : 2100
T2 - 30 = 40
T2 = 40 + 30
T2 = 70°C