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**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**

I'm currently studying A2 physics and I'm stumped on a particular question within a past paper involving internal energy of air. The question is as follows:

Estimate the internal energy of the air in a room of volume 24m^3 at a temperature of about 20˚C. Assume that the air behaves as an ideal gas at atmospheric pressure. Here are some useful formulae and data.

*There are several ways to make this estimate. You do NOT need to use all of the information.*

pV=nRT is the equation of state of

*n*moles of an ideal gas

kinetic energy of

*n*moles of an ideal gas = 3/2 nRT

data:

R = 8.31 J mol^-1 K^-1

density of air = 1.3 kg m^-3

molar mass of air = 0.030 kg mol^-1

atmospheric pressure = 1.0x10^5 Pa

Internal Energy = .......................................J

Any Ideas, Regards Tom