Volume of Gasses Obtained by Electrolysis of Salt Solution

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CroSinus
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Please post this type of questions in HW section using the template and showing your work.
Hello everybody!How can I calculate the volume of gasses produced by electrolysis of an aqueous solution of NaNO3 if the mass fraction of the salt changed from 40% to 60% (before electrolysis the mass fraction of the salt was 40% and after electrolysis it changed to 60%)? Pressure and temperature are 20 ºC and 99,8 kPa.Can you help me with my problem, please!

CroSinus
 
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Not enough information to solve the problem - you need to know what was the initial amount of the solution.

You can at best give the answer in terms of "volume of gas produced per kg of electrolyzed mixture".

Try to assume you started with 1 kg of mixture - does it help?
 
Thank you very much Borek for trying to help me.
The answer from my textbook says: V(O2) + V(H2) = 169,2 dm3
 
As I said - no way of getting this answer from the information you gave in this thread.