How do you work out the volume and concentration when moles are given?

  • Chemistry
  • Thread starter Soldat99
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  • #1
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Hi everyone.
I was doing a past paper. I got some of the question wrong about finding out Volumes and Concentrations

Could you please Help me with these Question.

I have enclosed the question sheet that has all the work done on it.

If you cant see image properly then use this link

http://img715.imageshack.us/img715/2527/examhelp.jpg [Broken]

P.s the answer on the sheet are wrong. Therefore I have attached another .jpg pic

Thank you very much for helping.
 

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Answers and Replies

  • #2
136
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Since you have the balanced equation and the number of mols of Na, you can find the number of mols of H2 by stoichiometry. Then multiply that by 24dm3.

eta: Use that same basic method to determine the NaOH concentration. You have V given to you.
 
  • #3
1,033
1
you haven't reacted 1 mole of Na to produce 1 mole of H2. You have reacted 0.05 moles
 

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