Question

Ibu mencampur 2 kg air yg suhunya 100 derajatC dg 5 kg air yg suhunya 30 derajatC . berapa suhu akhir campuran

Answer 1

T = (T1*m1+T2*m2)/(m1+m2)
T = (100*2+30*5)/(2+5) = 50 °C

Answer 2

Q lepas = Q terima
m.c air. ΔTa = m.c air. ΔTb
2. c air. (100-Tc) = 5.cair (Tc-30)
        2 (100-Tc)  = 5 (Tc-30)
          200 - 2Tc = 5 Tc - 150
                - 7Tc = -350
                    Tc = -350/-7
                         = 50 C