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P = 600 Watt, maka W = 600 x t sekon
T1 = 20°C
T2 = 100°C
t = 42 menit = 42 x 60 sekon
c air = 4200 J/kg°C
m = ...?
W = m . c. ΔT
W = m . c. (T2 - T1)
W = 600 x 42 menit x 60 sekon
600 x 42 x 60 = m x 4200 x (100 - 20)
m = 600 x 42 x 60 / 4200 x 80
m = 6 x 42 x 6 / 42 x 8
m = 6 x 6 / 8
m = 36 / 8
m = 4,5 kg
Jadi, massa air yang dipanaskan adalah 4,5 kg