# Calculating partial pressure of a gas from a sketch?

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• Anonymous
4 weeks ago

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• 1 month ago

I count 16 molecules of nitrogen and 4 molecules of oxygen.

So the mole fraction of N2 is 16 / (16 + 4) = 0.80

And the mole fraction of O2 is 4 / (16 + 4) = 0.20

The partial pressure of N2 is 0.080 kPa x 0.80 = 0.064 kPa

And the partial pressure of O2 is 0.080 kPa x 0.20 = 0.016 kPa

• Dr W
Lv 7
1 month ago

partial pressure O2 = mole fraction O2 * total pressure

partial pressure N2 = mole fraction N2 * total pressure

mole fraction O2 = moles O2 / (moles O2 + moles N2)

you can assume 4 moles O2 and 16 moles N2