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# percentage yield watch

1. how do u calculate the percentage yield of a substance??
2. only a guess but id say
moles of useful product/total moles created x100
or moles of product/moles of reactant x 100
what context is it in?
3. I've normally seen it used in the former example that Marisad_uk said. I've never seen it used in the other context.
4. (Original post by junners)
I've normally seen it used in the former example that Marisad_uk said. I've never seen it used in the other context.
ah like i said it was only a guess, probably the top one then, does make more sence dunnit
5. thanx.. ya i think its the top one... really appreciate it
6. Work out using a molar calculation how many moles you could produce

e.g. 2h202 --> 2h20 + O2
So if you start with 50 moles of hydrogen peroxide then you can make 25 mole of oxygen

Then it's how many moles you DID make over that 25 - all times 100 to get te percentage
only a guess but id say
moles of useful product/total moles created x100
or moles of product/moles of reactant x 100
what context is it in?

None of these definitions are correct. The percentage yield is defined to be the actual amount of product divided by the theoretical yield, which should hopefully be greater of the two, expressed as a percentage. Amount of product may be expressed in either moles or grams.

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