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Q = 2 × 4200 × 25
Q = 210.000 j/kg derajat celcius
T₁ = 25°C
T₂ = 100°C (suhu air mendidih)
ΔT = T₂ - T₁ = 100 - 25 = 75°C
c = 4200 J / (kg*°C)
Q = ?
Q = m * c * ΔT
Q = 2 * 4200 * 75 = 630.000 J = 630 kJ