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## Homework Statement

A house has a volume of 770 m^3. (a) what is the total mas of air inside the house at 20 Celsius? (b) If the temperature drops to -10 Celsius, what mass of air enters or leaves te house?

## Homework Equations

PV = nRT

## The Attempt at a Solution

I found the solution for part a which I think 924 kg. I found this answer by multiplying 770 m^3 by 1.2 kg (density of air at 20 Celsius: 1.2kg/m^3).

But I do not know how to find the answer to part b. I read the whole chapter but still did not know how. Please help me.