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Topic: Atoms to Molecules Answer Check  (Read 8595 times)

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Offline Violet89

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Atoms to Molecules Answer Check
« on: February 13, 2012, 05:14:23 AM »
If a sample of butane, C4H10, contains a total of 8.0 X 10^3 atoms of carbon, how many molecules of butane are in the sample?


8.0 X 10^3 atoms C * (1 formula unit C4H10 / 4 C atoms) * (6.022 X 10^23 C4H10 molecules / 1 formula unit C4H10) = 1.2 X 10^27 molecules C4H10


Is this correct?

Offline sjb

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Re: Atoms to Molecules Answer Check
« Reply #1 on: February 13, 2012, 05:20:12 AM »
If a sample of butane, C4H10, contains a total of 8.0 X 103 atoms of carbon, how many molecules of butane are in the sample?


8.0 X 103 atoms C * (1 formula unit C4H10 / 4 C atoms) * (6.022 X 1023 C4H10 molecules / 1 formula unit C4H10) = 1.2 X 1027 molecules C4H10


Is this correct?

Not quite, no. Why have you multiplied by Avogadro's number (what are it's units?)

Offline Violet89

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Re: Atoms to Molecules Answer Check
« Reply #2 on: February 13, 2012, 05:48:37 AM »
If a sample of butane, C4H10, contains a total of 8.0 X 103 atoms of carbon, how many molecules of butane are in the sample?


8.0 X 103 atoms C * (1 formula unit C4H10 / 4 C atoms) * (6.022 X 1023 C4H10 molecules / 1 formula unit C4H10) = 1.2 X 1027 molecules C4H10


Is this correct?

Not quite, no. Why have you multiplied by Avogadro's number (what are it's units?)

Thanks for the reply. Would you simply divide 8.0 X 10^3 by 4 then?

Offline Borek

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Re: Atoms to Molecules Answer Check
« Reply #3 on: February 13, 2012, 06:49:46 AM »
Yes.
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Offline Violet89

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Re: Atoms to Molecules Answer Check
« Reply #4 on: February 13, 2012, 07:19:56 PM »

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