amount of substance Alevel Chemistry

I am really struggling with amount of substance questions , and back titration questions on AS physical Chemistry. Can anyone offer any advice also I am unsure which moles to compare like for some questions they compare the molecule with the least amount of moles on the LHS to the RHS whereas in some questions they compare the Moles of the molecule with the most moles on the LHS to RHS

Reply 1

arjnair

To be honest Im no teacher. But I usually do pretty well in these.
My first step would be to identify the substance in both the reactions.

Then look for two pieces of information like concentration and volume to work out moles of some other thing in the equation. Make sure when you do this if it tells you mass make sure it is not a percentage mass equation if it isn’t you can use the mass.

Then use the ratio to work out the moles of the substance you want in both equations.

Then do the moles in first reaction - moles in second to find the moles that have reacted in the first equation.
Then you either use mr to find mass if it is a percentage Mass question or use the mass to work out mr if it isn’t an percentage mass question.

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