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# Need help with question

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1. Hello,
Could anyone please help me with calculating the volume rating of hydrogen peroxide.
I know that the equation of hydrogen peroxide is
2H2O (aq) ---> 2H2O (l) + O2 (g)
2 moles of hydrogen peroxide produces 1 mole of oxygen
(''20 volume'' means 1 cm3 of peroxide solution produces 20cm3 oxygen)

the question is:
you have 5cm3 of H2O2 and a total of 200 cm3 of O2 is made, what is the volume rating of the hydrogen peroxide?

Thank you
2. 40? I may be wrong, but if 5 cm3 makes 200, then 1 will make 40
3. thank you for replying, do you know if there is an equation for working out the volume rating

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