Question

In an experiment, on burning 3.5 Kg of fuel, 70,000 kJ of energy was
produced. Determine its calorific value.

Answer 1

Given:-

→Mass or amount of fuel burnt =3.5kg

→Amount of energy produced = 70000kJ

To find:-

→Calorific value of the fuel

Solution:-

We know that:-

Calorific value of a fuel :-

Amount of energy produced / Amount

of fuel burnt

= 70000/3.5

= 20000 kJ/kg

Thus, calorific value of the fuel is 20000 kJ/kg.

Some Extra Information:-

Calorific value : It refers to the heat produced by unit volume of a substance by complete combustion.

The efficiency of a fuel or food mainly depends on it's calorific value. If calorific value of a fuel is high, it's efficiency will be also high.

S.I. unit : The S.I. unit of calorific value is kJ/kg (Kilojoules-per Kilogram)

The calorific values (approximate) of some common fuels are :-

• LPG - 55000 kJ/kg

• Petrol - 45000 kJ/kg

• Diesel - 45000 kJ/kg

• Coal - 33000 kJ/kg

• Biogas - 40000 kJ/kg

• Wood - 22000 kJ/kg