A tank contains helium gas at 490 mmHg, nitrogen 0.75 atm, and neon at 520 torr. What is the total pressure in atm?

1 Answer
anor277
Dec 9, 2016

Well, we turn the measurements of pressure into #"atmospheres"#, and get...........

Explanation:

#P_"He"+P_(N_2)+P_"Ne"=#

#(490*mm*Hg)/(760*mm*Hg*atm^-1)+0.75*atm+(520*mm*Hg)/(760*mm*Hg*atm^-1)~=2*atm.#

You know that #1*atm-=760*mm*Hg#. Or rather that one atmosphere will support a column of mercury #760*mm# high. You must simply know this. This measurement of pressure should not really be used above #1*atm#.

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