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Topic: determining the number of atoms present  (Read 3972 times)

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Offline guateboy22

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determining the number of atoms present
« on: April 02, 2008, 07:09:21 PM »
hi, well i got a question that asks me to Determine the number of oxygen atoms present in 12.00 grams of calcium dihydrogen phospahte. But i dont know how to get it all i kno is that is has something to do with N= n x NA and m= n x M so if someone can help me and show me how they got the answer it would be much appreicated.
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Offline enahs

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Re: determining the number of atoms present
« Reply #1 on: April 02, 2008, 07:12:51 PM »
What is the molecular formula for calcium dihydrogen phosphate?

If you have 12 grams, how many mols do you have?
If you have that many mols, how many molecules of calcium dihydrogen phosphate do you have?
How many atoms of oxygen are in each molecule?

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Offline guateboy22

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Re: determining the number of atoms present
« Reply #2 on: April 02, 2008, 07:16:45 PM »
ok so when i kno how many molecules i have what do i do then?
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Offline Guitarmaniac86

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Re: determining the number of atoms present
« Reply #3 on: April 02, 2008, 07:42:45 PM »
enahs has pretty much covered this.

Once you have found the number of molucules you have, you need to see how many oxygen atoms one molecule contains. Multiply this by the number of molecules to arrive at the answer.

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Don't believe atoms, they make up everything!

Offline guateboy22

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Re: determining the number of atoms present
« Reply #4 on: April 02, 2008, 08:10:32 PM »
oooo alrite yea ok i get it. thanx some much for your help both of u. now im gonna Ace my test 2mrrw
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