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OpenStudy (anonymous):
What mass of Helium gas is present in a 15-L sample of this mixture at 265K? I had just found the partial pressure of Helium gas in mmHg, which came out to 248mmHg.
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OpenStudy (australopithecus):
Use ideal gas law PV = nRT First paragraph explains what all the variables are: https://en.wikipedia.org/wiki/Ideal_gas_law But it is probably a better link to look at this site: http://www.chemguide.co.uk/physical/kt/idealgases.html
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