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Topic: molecular formula  (Read 3407 times)

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Offline rm

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molecular formula
« on: June 03, 2008, 11:16:02 AM »
a gas has been analyzed and it is shown to be composed of 85.7 % carbon and 14.3 hydrogen by mass. At STP 0.100 L of the compound weighs 0.188g. What is the molecular formula for this compound.

im having some trouble with it
any help would be great
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Offline DrCMS

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Re: molecular formula
« Reply #1 on: June 03, 2008, 11:26:37 AM »
What is the volume of 1 mole of an ideal gas at STP?
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Offline rm

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Re: molecular formula
« Reply #2 on: June 03, 2008, 01:35:05 PM »
it is 22.4L/mol
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Offline sjb

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Re: molecular formula
« Reply #3 on: June 03, 2008, 02:26:22 PM »
So if 0.100 L of gas weighs 0.188g, and 1 mol of gas has volume 22.4 L, what is the molecular weight of the gas?
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