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Topic: calculating composition of mixture in mol%?  (Read 2711 times)

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Offline Frankkyx

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calculating composition of mixture in mol%?
« on: September 22, 2012, 09:49:01 AM »
Hello guys,

i was wondering this is the question i'm having trouble with

" A liquid mixture contains 12% ethanol, 6% propanol and the balance water. What is the composition of the mixture in mol%? "

Any help would be appreciated

Thanks
Frankkyx
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Offline Borek

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Re: calculating composition of mixture in mol%?
« Reply #1 on: September 22, 2012, 10:05:55 AM »
Assume 100g of the mixture. Does it help?
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Offline Frankkyx

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Re: calculating composition of mixture in mol%?
« Reply #2 on: September 25, 2012, 02:53:12 AM »
haha yeh thank you, dont know why i did not think of that...

another question ? how can i find the average molecular mass of the mixture ?

is it Mass total / moles total ?
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Offline Borek

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Re: calculating composition of mixture in mol%?
« Reply #3 on: September 25, 2012, 08:17:47 AM »
You need weighted average.
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