Heat produced on burning 6.3 g of a fule raises the temperature of 1.5 kg of water from 30⁰C to 60⁰C.Given that the specific heat of water is 4.2 J/g ⁰C.Calculate the calorific value of the fuel.

Options

(a) 30 kJ/mol
(b) 30 kJ/g
(c) 30 kJ/kg
(d) 30 kJ/mg

Correct Answer:

30 kJ/g

Explanation:

Q = msΔt ,
Q = 1.5 x 4.2 x (60-30) x 1000, Q = 189 x 10³ J , Calorific value = 189 x 10³ / 6.3 = 30 kJ/g.