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    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
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    (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

    There's your 40
 
 
 
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