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OpenStudy (biodelta):
How many atoms of Helium in a volume of : 4.25 x 10 ^ - 9 cubic meters @ 25 deg celcius?
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OpenStudy (osprey):
I've had a look at what you have written. It would probably help if you could find a way of showing the whole question. Reason is that I don't think there's enough information so far to solve it. For example, what's the pressure in/on the helium ?
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