Jawabanmu

2014-05-13T23:24:23+07:00
Qes = Mes x Ces x delta T
       = 2 x 2100 x 10
       = 42000

Qair = Mes x Cair x delta T
       = 2 x 4200 x 50
       = 420000

Qlebur = Mes x Clebur
           = 2 x 336000
           = 672000

Qair - Qes = 420000 - 42000
                = 378000 J (kalo ga salah ya)
Qtotal = Qes + Qlebur + Qair = 42.000 j + 672.000 j + 420.000 j = 1.134.000 j = 1.134 Kj
2014-05-14T02:07:53+07:00
Dik=
m= 2kg
ces=2100 J/kg°c
c=4200 J/kg°c
L=336000 J/kg
dit = Q jika t=-10°C menjadi 50°C
jwb
Q=Q₁₊Q₂₊Q₃
Q=m.ces.Δt+m.L+m.c.Δt
Q=2.2100.(0-(-10))+2.336000+2.4200.50
Q=42000+672000+420000
Q=1134000J
Q=1134 kJ