A house with a 2.90 m high ceiling and 1.70 x 103 m2 floor areas is to be heated with propane. Determine the number of kilograms of propane would be required to raise the temperature of the air inside the house from 14.4 o C to 23.1oC? The average density of air over this temperature range can be estimated to be 1.22 g/L. The molar specific heat of the air inside the house is 30.2 J mol -1 oC-1. The average molar mass of air is having the 29.1 g/mol. 1 L = 1 ×10-3 m3 and the molar heat of combustion of propane is having 2220.047 kJ/mol.