Chemical Fuel Question

Hey /sci/, how would you solve this?

A house with a 17.7 x 103 ft2 floor area and 9.50 ft high ceilings is to be heated with propane. How many kilograms of propane would be needed to raise the temperature of the air inside the house from 63.0F to
72.0F ?. In this calculation your are ignoring the temperature of the walls etc.

The molar specific heat of the air inside the house is 30.2 J mol -1C -1
The average density of air over this temperature range can be estimated to be 1.22 g/L.
The molar mass of air is 29.1 g/mol.
There are 28.317 liters in a cubic foot.
The molar heat of combustion of propane is -2220.047 kJ/mol

you reread dimensional analysis which is chapter 2 in your gr 10 textbook

>>1
air: cubic feet -> liters -> grams -> mols
temperature difference: F -> Celsius

now that you have both of those you can calculate 'Q' the heat you'll need to heat up __ mols of air by __ C degrees

assuming all the heat generated by the propane is used to heat the air:
Qpropane = -Qair
you now have how much heat your propane needs to generate

propane : Q -> mols -> kg