Jawabanmu

2014-09-09T13:58:09+07:00
Qserap = Qlepas
m_{dingin} . c_{air} . ΔT_{1} = m_{panas} . c_{air} . ΔT_{2} ... coret nilai c_{air} kedua ruas
m_{dingin} x ΔT_{1} = m_{panas} x ΔT_{2}
300 x (40 - 0) = m_{panas} x (100 - 40)
300 x 40 = m_{panas} x 60
12000 = m_{panas} x 60
m_{panas} =  \frac{12000}{60}
m_{panas} = 200 gr

check ulang hitunganny ya, semoga membantu:)