How do I find average kinetic energy if I don't have mass of the gas?

Domuks
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Homework Statement
I have single atom pressure (p) and molecule concentration (n) and I need to find average kinetic energy (EKavg)
Relevant Equations
NA
So always in my problems i had mass (M) but now i don't and it seems impossible to solve this problem if I don't have mass I think i am missing something. I was looking for similar problems in my book and internet and didn't find any.
 
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What is "single atom pressure"? I am unfamiliar with the term.
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

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