The heat liberated on complete combustion of 0.5 g of kerosene raises the temperature of 200 g of

The heat liberated on complete combustion of 0.5 g of kerosene raises the temperature of 200 g of water by 25 degree C. The specific heat of water is 4.2 J/g degree C. Calculate the calorific value of kerosene ?

Solution -

Given,

Mass of kerosene = 0.5 g

Mass of water = 200 g

Rise in temperature of water(△t) = 25 degree C

Specific heat of water = 4.2 J/g degree C

Heat absorbed by water = m×C×△t

=200×4.2×25 J

=21000 J

=(21000 /1000)= 21 KJ

Therefore,

Calorific value of Kerosene = Total heat produced / Mass of fuel

= 21 KJ / 0.5 g = 42 KJ/g