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m es. L + m es. c air. T = m air. c air. (25-T)
50.80 + 50.1.T = 300.1.(25-T)
350T=7500-4000
T=10°
m.es = 50 g
L = 80 kal/g
ΔT₁ = Tc
T₂ = 25°C
m.air = 300 g
c.air = 1 kal/g°C
ΔT₂ = 25 - Tc
Dit : Tc = ....?
Jwb : Q lepas = Q terima
m.air c.air ΔT₂ = m.es L + m.es c.air ΔT₁
300 x 1 x (25 - Tc) = 50 x 80 + 50 x 1 x Tc
6 x (25 - Tc) = 80 + Tc
150 - 6Tc = 80 - Tc
7Tc = 70
Tc = 10°C