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

[Soldat99]

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 can't see image properly then use this link

http://img715.imageshack.us/img715/2527/examhelp.jpg

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

Thank you very much for helping.

 

[p21bass]

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.

 

[dacruick]

you haven't reacted 1 mole of Na to produce 1 mole of H2. You have reacted 0.05 moles