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Topic: Find the molecular formula Problem help pls?  (Read 2340 times)

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Offline Deymark90

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Find the molecular formula Problem help pls?
« on: October 20, 2011, 01:24:11 PM »
Im not english but il try and translate:
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 From burning of 11.2 ml of gas hydrocarbure we obtained 44 mg CO2 and 0.027 g H2O.Find the molecular forumla of the hydrocarbure.
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 I think we have to use that 22.4 but im not sure
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Offline Dan

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Re: Find the molecular formula Problem help pls?
« Reply #1 on: October 20, 2011, 01:46:21 PM »
Start with the equation for the reaction, using a general formula for your hydrocarbon CxHy:

CxHy + ? :rarrow: ? + ?
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Offline Deymark90

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Re: Find the molecular formula Problem help pls?
« Reply #2 on: October 20, 2011, 01:56:52 PM »
i gotta start whit if at 11,2 that result ,then at 22,4 what result
then empiric formula i think or something like if at 18 g h2o...2 H then at 0,057 ...x h or something like that
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Online Borek

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Re: Find the molecular formula Problem help pls?
« Reply #3 on: October 20, 2011, 05:16:15 PM »
Convert everything to moles.
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