A family consumes 12kg of L.P.G in 30 days. Calculate the average energy consumed per day, if the calorific value of L.P.G is 50kJ/kg.

Academic Chemistry NCERT Class 8

A family consumes 12kg LPG in 30 days.

then, the family consumes LPG in a day = 12/30 kg = 0.4 kg .

The calorific value of LPG = 50J/kg

(Calorific value is the measurement of heat produced by a specific amount of fuel or food. It is usually expressed in joule per kg.)

The average energy consumed per day = calorific value of LPG × amount of LPG consumed in a day

= 50 × 0.4 J = 20J

Hence, 20J of energy is consumed per day.

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Updated on: 10-Oct-2022

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