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Topic: determination of the chemical formula  (Read 1755 times)

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Offline johnnyjohn993

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determination of the chemical formula
« on: October 20, 2014, 06:33:41 AM »
1.375g of Mannitol completely reacted with oxygen thus producing 1.993g CO2 and 0.9519g water what is the empirical formula of Mannitol.

umm I really don't know where to start. pls help

all i know is the oxygen has a mass of 1.5699g

Offline Arkcon

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Re: determination of the chemical formula
« Reply #1 on: October 20, 2014, 08:51:39 AM »
all i know is the oxygen has a mass of 1.5699g

Really?  That's pretty good.  How did you get that number.  Begin with a balanced reaction.  You don't know the formula for a reactant, so put a place holder [mannitol].  But can you see where the carbon dioxide and what came from?  How much carbon and hydrogen is that?  Careful, mannitol may provide some of its own oxygen.
Hey, I'm not judging.  I just like to shoot straight.  I'm a man of science.

Offline johnnyjohn993

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Re: determination of the chemical formula
« Reply #2 on: October 22, 2014, 03:45:17 AM »
I got the answer now, I use the mole concept that is, our reactant have the same total amount of mole to the sum of the moles of the the product :D cool :D

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