jwb dong. ......plis

1.
m = 2 kg
∆T = 100° - 28° = 72°C
C = 4200 J/kg°C
Q ?

Q = m air . C air . ∆T
Q = 2 . 4200 . 72
Q = 604800 Joule

2.
∆T = 83-23 = 60°C
m Al = 0,5 kg
C Al = 900 J/kg°C

Q = m . C . ∆T
Q = 0,5 . 900 . 60
Q = 27×10³ Joule