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Topic: Question for Chemistry Final Tomorrow - Mass Precentages  (Read 5949 times)

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Offline Politik780

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Question for Chemistry Final Tomorrow - Mass Precentages
« on: January 13, 2008, 10:16:33 PM »
This is the question in my book...

Two compound samples are found to have the same mass pecentages of the same elements.  What can you conclude about the two samples?

Is the answer: "They are the same compounds" or "They are different compounds"

I really need this answer for my chemistry final tomorrow...preferably tonight!!!

Please!!!
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Offline Alpha-Omega

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #1 on: January 13, 2008, 10:46:51 PM »
Proust: Law of Definite Proportions: a given compound ALWAYS contains the same relative proportions of elements by mass.

LINK:  http://en.wikipedia.org/wiki/Law_of_definite_proportions
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Offline Mitch

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #2 on: January 13, 2008, 11:10:42 PM »
ozone and oxygen would be an exemption.
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Offline LQ43

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #3 on: January 13, 2008, 11:33:57 PM »
yes an exemption ;) ozone and oxygen not apply as they are allotropes of an element and not compounds
« Last Edit: January 13, 2008, 11:49:10 PM by LQ43 »
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Offline Mitch

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #4 on: January 13, 2008, 11:48:21 PM »
cycloalkanes and their linear alkylenes too.
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Offline LQ43

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #5 on: January 13, 2008, 11:52:04 PM »
Quote from: Mitch on January 13, 2008, 11:48:21 PM
cycloalkanes and their linear alkylenes too.

yes that works  :), I knew there were exceptions, but couldn't even think of one
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Offline Borek

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Re: Question for Chemistry Final Tomorrow - Mass Precentages
« Reply #6 on: January 14, 2008, 03:19:15 AM »
Quote from: Politik780 on January 13, 2008, 10:16:33 PM
Two compound samples are found to have the same mass pecentages of the same elements.  What can you conclude about the two samples?

Is the answer: "They are the same compounds" or "They are different compounds"

Neither.

http://en.wikipedia.org/wiki/Isomer
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