A room contains 48 kg of air. How many kilowatt-hours of energy are necessary to heat the air in the house from 7 °C to 28 °C? The heat capacity of air is 1.03 J/g °C.

Solution 102P :

Step 1:

Mass of air = 48 kg.

heat capacity of air(C) = 1.03 J/g °C

kilowatt-hours of energy are necessary to heat the air in the house from 7 °C to 28 °C= ?

Here we have to determine the amount of heat required to heat air. This can be calculated by the formula :

Q = mc