Heating of water and kettle?

Question

A 0.5-kg aluminum teakettle contains 3 kg of water at 23°C. How much heat is required to raise the temperature of the water (and kettle) to 100.0°C?

Answer 1

Q=Q(water) + Q(aluminum)=
Q=[Cp(water) m(water) +Cp(water) m(water) ](T2-T1)
Q=[1 x 3 + 0.215 x 0.5](100-23)
Q=239 cal