On burning 5.0 g of a fuel, heat is produced which raises the temperature of 1.0 Kg of water from 25

On burning 5.0 g of a fuel, heat is produced which raises the temperature of 1.0 Kg of water from 25 degree Celsius to 55 degree Celsius. Determine the Calorific value of the fuel.

(Specific heat of water = 4.2 J/g/degree Celsius)

Solution -Given, Mass of fuel = 5.0 g

Mass of water =1000 g

Initial temperature of water = 25 degree C

Final temperature of water = 55 degree C

Specific heat of water = 4.2 J/g/degree C

Therefore,

Rise in temperature of water (△t) = 55-25 = 30 degree C

Heat absorbed by water = m × C × △t = 1000 × 4.2 × 30 J

= (1000 × 4.2 × 30)/ (1000) KJ

= 126 KJ

Therefore,

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

= 126 KJ / 5 g = 25.2 KJ/g

#brainsnippers

#cbse_board_exams