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P = 600 W
∆T = 80°
t = 42 menit = 42x60 = 2520 s
c =4200 J/Kg°C
Q = m.c.∆T
Q = P.t
m.c.∆t = P.t
m.4200.80 = 600 . 2520 s
m x 336.000 = 1.512.000
m = 4,5 kg