| empirical formula - Please help |
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jruiz3
Junior Member
Joined: 18 Sep 2006
Posts: 8
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 Posted: Mon Sep 18, 2006 3:41 pm Post subject: empirical formula - Please help |
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A compound with molar mass 180.2 g/mol has the following composition:
C 60.0%
H 4.48%
O 35.5%
Determine the empirical formula?
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yhtu22
Junior Member
Joined: 18 Sep 2006
Posts: 5
Location: San Marcos, TX
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| Posted: Mon Sep 18, 2006 10:55 pm Post subject: |
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do you have a solutions manual?
I can take a guess at this one... but would feel better if you knew what was the correct answer and then work from there.
is it C9H804
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RobJim
Senior Member
Joined: 13 Feb 2005
Posts: 320
Location: Los Angeles, CA
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| Posted: Tue Sep 19, 2006 4:59 pm Post subject: |
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| Figure out what the mass of each element is by multiplying it's percentage by the total mass. Then, divide each of those masses by the molar mass of that element. This will give you the number of moles of that element. Then, you should be able to see that the molar amounts of the elements are all integer multiples of some number. Divide each of them by that number.
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jruiz3
Junior Member
Joined: 18 Sep 2006
Posts: 8
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| Posted: Tue Sep 19, 2006 7:44 pm Post subject: thank you! |
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| I want to thank you both. yhtu22 for the correct answer and RobJim for the steps to solve the problem.
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