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# OCR A2 Chemistry - Equilibrium moles watch

1. My teacher has gave me a sheet with this question on it, and I don't quite understand what I'm supposed to do?

All help appreciated!

2. (Original post by Josh-H)
My teacher has gave me a sheet with this question on it, and I don't quite understand what I'm supposed to do?

All help appreciated!

You are supposed to calculate how many moles of each species will be present at equilibrium...
3. So for the first one A + B ---> 2C

''A'' goes from 1.0 to 0.3 meaning that 0.7 moles of the reactant ''A'' have reacted to become products...as the ratio of A to B is 1:1 it must mean there is 0.3 moles of B at equilibrium too. Can you work how much of ''C'' there will be given that info?
4. (Original post by EierVonSatan)
So for the first one A + B ---> 2C

''A'' goes from 1.0 to 0.3 meaning that 0.7 moles of the reactant ''A'' have reacted to become products...as the ratio of A to B is 1:1 it must mean there is 0.3 moles of B at equilibrium too. Can you work how much of ''C'' there will be given that info?
I got that bit, that's where I got confused, I didn't know if C was 1.4 or 0.6 (as its 2 mols so 2 x 0.3?) maybe neither?
5. (Original post by Josh-H)
I got that bit, that's where I got confused, I didn't know if C was 1.4 or 0.6 (as its 2 mols so 2 x 0.3?) maybe neither?
Well if 0.7 moles of A (and 0.7 moles of B) reacted then twice that much of C is formed - so it's 1.4 moles
6. (Original post by EierVonSatan)
Well if 0.7 moles of A (and 0.7 moles of B) reacted then twice that much of C is formed - so it's 1.4 moles
Oh yeh :P: sorry, thick moment. Cheers!

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