Question

when 500 gram of boiling water is poured into a mug which weighs 0.15 kg , the temperature of water falls to 70 degree celsius , if the specific heat capacity of the substance of the mug is 800J/kgdegree celsius ,then the amount of heat lost by water will be​

Answer 1

It's really very simple…

See heat lost by water = mass of the substance × specific of the substance × temp diff.

Now water boils at 100°c and it is cooled when poured to 70℃ .

We know that specific heat of water is 4.18 kj/kg ℃ .

Mass of the water as given 0.5 kg

Thus heat lost by water = 0.5 × 4180 × (100 - 70) = 62.7 kj