Question

Misturam-se 40l de agua a 60°C com 20l de agua a 30°C.Calcule a temperatura final da mistura.

Answer 1

40L = 40000g
20L = 20000g
Q1 + Q2 = 0
m1. c. ΔT + m2. c. ΔT = 0
40000 * 1 * (TF - 60) + 20000 * 1 * (TF - 30) = 0
40000TF - 2400000 + 20000TF - 600000 = 0
6x10^4*TF = 24x10^5 + 6x10^5
TF = (30x10^5)/6x10^4
TF = 50ºC