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Need help at Math

post #1 of 9
7/18/10 at 7:39pm
Thread Starter 

What is one mole of the compound nitrogen pentoxide, what fraction of the total number of ions is the oxygen ion? Please help. 

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post #2 of 9
7/18/10 at 7:53pm

With complete dissociation, I believe that it'd be 5/7. However, it's been a while since AP chem, so there might be something I'm forgetting.

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post #3 of 9
7/18/10 at 7:55pm
Thread Starter 

sorry for this, but do you mind if you show your work

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post #4 of 9
7/18/10 at 8:05pm

N2O5, complete dissociation, so for every mole of N2O5 dissolved, there are 2 moles of N and 5 moles of O in solution. Go part over whole, so you get 5/7. 

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post #5 of 9
7/18/10 at 8:22pm

Whoa whoa.  N2O5 does NOT dissociate like that. 

 

This seems like a strange question.

 

I'm not entirely sure, but would it split into [NO2+][NO3-]?

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post #6 of 9
7/18/10 at 8:27pm

Yeah, but the question is asking what proportion the oxygen ions are in solution, so I was assuming that it was dissociating into straight nitrogen and oxygen, not nitrate and nitrite.

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post #7 of 9
7/18/10 at 8:31pm
Thread Starter 

Hey, i have got about 5 answers total from other websites too. And i think 5/7 is right. Good job.

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post #8 of 9
7/18/10 at 8:31pm
Quote:
Originally Posted by ccbass View Post

Whoa whoa.  N2O5 does NOT dissociate like that. 

 

This seems like a strange question.

 

I'm not entirely sure, but would it split into [NO2+][NO3-]?


According to my much more knowledgeable chem friend, you are right, but the question still confuses me.

 

EDIT: Actually, he's saying that it would dissociate into 2 moles of nitric acid, but whatever. 


Edited by logwed - 7/18/10 at 8:33pm
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post #9 of 9
7/18/10 at 9:26pm
Thread Starter 

thread closed. thanks

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