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Topic: How many atoms in sample?  (Read 5535 times)

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Offline s3a

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How many atoms in sample?
« on: September 15, 2009, 12:27:25 PM »
I do not know how to do the following question:

Potassium permanganate, KMnO4, is a dark purple crystalline solid used as an antiseptic, and in deodorizers and dyes.

a) How many potassium atoms are there in a 7.238g sample of KMnO4?
b) How many oxygen atoms are there in the above sample?

Answer for a): 2.758*10^22 K atoms
Answer for b): 1.103*^23 O atoms

Any help would be greatly appreciated!
Thanks in advance!
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Offline Borek

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Re: How many atoms in sample?
« Reply #1 on: September 15, 2009, 12:57:13 PM »
7.238 g - how many moles of KMnO4?

How many molecules per mole?

How many potassium atoms per molecule?
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Offline s3a

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Re: How many atoms in sample?
« Reply #2 on: September 15, 2009, 02:44:08 PM »
Oh I get it! The "How many potassium atoms PER MOLECULE?" is what cleared it for me. Thanks!
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