What is the total translational kinetic energy of the gas molecules

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Homework Statement


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)?


Homework Equations


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


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.
 

Answers and Replies

  • #2
jgens
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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.
 

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