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Homework Help: G? of KClO3 to produce 50g of O2

  1. Sep 17, 2011 #1
    We had this question in the lecture .. but I couldn'nt copy the steps I was trying to understand but I dind'nt looool.

    How many grams of KClO3 are required to produce 50 g of 02 from the following decomposition reaction?

    2KClO3 ---> 2kClO3 + 3O2

    the final answer is 127

    I tried to work it out by myself by making a ratio

    molar mass of 2KClO3 = 148.8 and for 3O2 = 48

    grams of 02 = 3*50 = 150 grams
    grams of of 2KClO3 = x

    x\148 : 150\48


  2. jcsd
  3. Sep 17, 2011 #2


    User Avatar

    Staff: Mentor

    You are doing strange things.

    Huh? I guess it should be KCl on the right.

    What do you mean by "molar mass of 3O2"? No such animal. There is a molar mass of O2. It is not 48.

    No, 50 grams of O2. This is a number given in the question.

    I am not even going to try to understand your ratio, as numbers you put in it are already off.

    Try these pages:

    stoichiometric calculations in general

    stoichiometric calculations using ratios
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