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# Need help with finding moles in 5% hydrogen peroxide watch

1. So I did an experiment and the solutions were labelled 5%, 10%, 15%, etc. hydrogen peroxide? How would I calculate how many moles is in 5% or would it just be 0.05 moles?
2. 5% H202 would mean that for every dm^3 of solution, there's 50cm^3 of H202
You can use this to work out the molarity

(Original post by electrx)
So I did an experiment and the solutions were labelled 5%, 10%, 15%, etc. hydrogen peroxide? How would I calculate how many moles is in 5% or would it just be 0.05 moles?
3. (Original post by Kvothe the Arcane)
5% H202 would mean that for every dm^3 of solution, there's 50cm^3 of H202
You can use this to work out the molarity
Does that mean I divide this by the molar mass of H2O2 to find the number of moles?
4. (Original post by electrx)
Does that mean I divide this by the molar mass of H2O2 to find the number of moles?
Well we're going to need to know the volume of the solution before we can determine that.

5% solution in a litre is going to contain more moles than a 5% solution in half a litre.

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Updated: February 11, 2017
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