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 Post subject: A chem problem. Don't know how to start.Posted: Sun, 8 Mar 2009 12:01:47 UTC
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A hydrocarbon mixture contains an acid and another unidentified component. The mass fraction of the acid is 0.387 while its mole fraction is 0.317. The molecular weight of the acid is 60.05. What is the molecular weight of the other unidentified component.

I don't how to begin doing the question. Help would be appreciated.

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 Post subject: Re: A chem problem. Don't know how to start.Posted: Sun, 8 Mar 2009 15:26:35 UTC
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kirby wrote:
A hydrocarbon mixture contains an acid and another unidentified component. The mass fraction of the acid is 0.387 while its mole fraction is 0.317. The molecular weight of the acid is 60.05. What is the molecular weight of the other unidentified component.

I don't how to begin doing the question. Help would be appreciated.

Set it up as a table

So from the last row and the middle row, 0.683 moles of the unidentified substance weighs 0.317*60.05*(0.613/0.387) grammes, so molecular weight of the unidentified component is ...

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