Homework Help: Partial Pressure- Chemistry

Posted by Sarah on Tuesday, September 23, 2008 at 1:30am.

A gaseous mixture of O2 and N2 contains 31.8 % nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 445 mmHg?

Partial Pressure- Chemistry - bobpursley, Tuesday, September 23, 2008 at 4:20am
The partial pressure of the gasses reflects the mole ratios of the gasses.

http://en.wikipedia.org/wiki/Partial_pressure

Assume 100grams of gas. 31.8 grams is N2, or the moles of N2 is 31.8/28=1.14
The moles of O2 will be 68.2/32=2.15

pressureN2/PressureO2 =
X/(445-x)=1.14/2.15

2.15x=1.14(445-x)
3.29x=507
pressureN2=154
pressureO2=291mmHg

check my work.
Partial Pressure- Chemistry - Sarah, Tuesday, September 23, 2008 at 10:42am
your answer was correct!
Partial Pressure- Chemistry - bj, Sunday, December 6, 2009 at 4:54pm
it looks complicated, but substitute your own numbers and follow his math process and it all works out for correct answer.
my P=825mmHg and 36.8% N2 was worked correctly.
Partial Pressure- Chemistry - Eva, Wednesday, February 16, 2011 at 11:14am
geh ficken ;)tut gut glaub mir :)

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