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Calculate the translational kinetic energy of O2 at

a) 300. K
b) 1000. K

Speed is not given. Do I need to find the average speed first?

The formula I'm using is
Ek= 1/2m v^2
I notice I'm not given mass in the problem either. Would I use molar mass?

You are on a tangent. You need to be using 3/2 kT

http://hyperphysics.phy-astr.gsu.edu/hbase/kinetic/kintem.html

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