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# rate of h2o2 decompisition watch

1. i don't understand how to explain why 40 is used for the calculation fo concentration of hydrogen peroxide

i need to calculate the rate of decomposition of hydrogen peroxide

i used 2 vol h2o2 and 20cm3
i measured volume of oxygen absorbed

and i know that from the equation for the rate of decomposition of h2o2 there are 2 mol of oxygen so 40cm3 of oxygen totally decomposed
why do i have to use 40 in the calculation for hydrogen peroxide cocnentration
the formual is 40-volume of oxygen collected/240

i understand but how does this all link

can someone explain it to me clearly and logically please
2. (Original post by esmeralda123)
i don't understand how to explain why 40 is used for the calculation fo concentration of hydrogen peroxide

i need to calculate the rate of decomposition of hydrogen peroxide

i used 2 vol h2o2 and 20cm3
i measured volume of oxygen absorbed

and i know that from the equation for the rate of decomposition of h2o2 there are 2 mol of oxygen so 40cm3 of oxygen totally decomposed
why do i have to use 40 in the calculation for hydrogen peroxide cocnentration
the formual is 40-volume of oxygen collected/240

i understand but how does this all link

can someone explain it to me clearly and logically please
You have not explained the problem clearly and logically!

20cm3 of 2 volume hydrogen peroxide releases 40 cm3 of oxygen

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