Tolong bantu jawab ya..

2.
Dik :
m = 0,4 kg
c = 138 J/kg°C
Rumusnya : H = m x c
Ditanya : kapasitas kalor (H)
H = 0,4 x 138
H = 55,2 J/°C

3.
Dik :
Q = 42000 J
c = 350 J/kg°C
Δt = 20 °C
Rumusnya : Q = m x c x Δt
Ditanya : massa (m)
42000 = m x 350 x 20
m = 42000/7000
m = 6 kg

4.
m = 7 kg
Δt = (100-30) °C
c = 2,25 x 10^6 J/kg°C
Rumusnya : Q = m x c x Δt
Ditanya : Kalor (Q)
Q = 7 x 70 x 2250000
Q = 1102500000 J
Q = 1,1025 x 10^6 kJ