Translational Kinetic Energy

[tag16]

1. The problem statement, all variables and given/known data
What is the total translational kinetic energy of the gas molecules of 0.450 mol of air at atmospheric pressure that occupies a volume of 5.00 L (0.00500 m3)?


2. Relevant equations
P=2/3(N/V)<Ktr>
N= 0.450 mol
V= 5.00L
Want to find Ktr


3. The attempt at a solution
The problem is I don't know the pressure to use this formula or how to figure out what it is from the given information, if that's possible.

[jgens]

Well, atmospheric pressure is 1 atm = 760 mm Hg = 101.3 kPa.

If you need more help, given that the translational kinetic energy of one molecule of gas is KE = 3kT/2, use the formula PV = NkT to derive the formula for the case that you're dealing with.