I’ve tried searching for it, but all I get as a response is how to calculate the mass of a baloon filled with helium knowing the atomic mass of helium, which doesnt help. But I haven’t been able to know how the atomic mass of Helium was discovered/calculated and I have been searching for an explanation for a while, thought this might be a place where I could get an answer especially since I presume it to involve complex physics. Thanks in advance to anyone who helps
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If you know the density of helium gas at a fixed temperature and pressure, which is the normal kind of fussy to work out (ie, careful measurements and lots of mistakes), you can apply the [ideal gas law](https://en.wikipedia.org/wiki/Ideal_gas_law) to calculate the number of helium particles per gram, which is what you’re looking for. And, if I remember my chemistry correctly, you’ll get lucky, because helium obeys the ideal gas law better than some other, more familiar gasses.
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