Question

1)
How much heat energy is necessary to raise the temperature
of 5 kg of water from 20°C to 100°C ?​

Answer 1

Answer:

's = Q/nΔt

Q = snΔt = 4.1×5000/18 ×80 = 91000j = 91 kj

We need 91000 joules of energy.

HOPE IT HELPS.....