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Topic: Average Molecular Mass -- Composition of a Gaseous Mixture  (Read 8685 times)

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Offline imperius

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Average Molecular Mass -- Composition of a Gaseous Mixture
« on: November 10, 2007, 01:06:27 PM »
Suppose a sample of refrigerant gas consisting of a simple mixture of the gases pentafluoroethane (C2HF5) and 111-trifluoroethane (C2H3F3) has a density of 3.48 g/L at 31 °C and 0.902 atm.

Calculate the average molecular mass for this sample.

What equations should I use?
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Offline LQ43

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Re: Average Molecular Mass -- Composition of a Gaseous Mixture
« Reply #1 on: November 10, 2007, 01:18:10 PM »
PV=nRT and MM = g/n
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Offline imperius

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Re: Average Molecular Mass -- Composition of a Gaseous Mixture
« Reply #2 on: November 10, 2007, 02:23:06 PM »
thanks, but i still dont get it. What steps do you follow to solve it and it needs to be in amu, whatever that is.
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Offline enahs

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Re: Average Molecular Mass -- Composition of a Gaseous Mixture
« Reply #3 on: November 10, 2007, 02:55:02 PM »
http://members.aol.com/profchm/idealgas.html

Problem 4 is very similar, however in your problem you are given density and asked to solve for Molecular Mass, where as in the problem on the page you are solving for Density.

But give it a look over and then see if you can figure it out from that!
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