Question

4 kg of water was

added to a 1.2 kg iron
boiler. How much
heat must be
supplied to the boiler
to heat the water in it
from 16 °C to 90 °C

Answer 1

Given :

Mass =5kg

T

1

=20

∘

C,T

2

=100

∘

C

ΔT=100−20=80

∘

C

Q=m×C×ΔT

where C= specific heat capacity of water

=4200J/(kgK)

Q=5×4200×80

=1680000 Joule.

=1680KJ