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February 28, 2015

February 28, 2015

Posted by **Johnson** on Sunday, April 20, 2008 at 11:28am.

Ideal gas formula is pv=nrt,but the problem is asking me to find the mass?

- Physics -
**Count Iblis**, Sunday, April 20, 2008 at 1:17pmCompute the number of moles n first. You can then say that:

n = n_{N2} + n_{O2}

You also know that:

n_{N2}/n = 0.79

and

n_{O2}/n = 0.79

This allows you to solve for n_{N2} and n_{O2}. Using the molar masses for N2 and O2 you can then obtain the mass.

- Physics -
**Anonymous**, Monday, March 21, 2011 at 11:45pmAir is a mixture of nitrogen, oxygen, and other gases.

At STP, one mole of an ideal gas occupies 22.4 liters.

Assume air is 21% O2 and 79% N2 by volume

0.21 x 32 g/mol + 0.79 x 28 g/mole = 28.8 g / mol of "air"

28.8 g / 22,400 mL = 0.0013 g/mL

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