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    tonrogers's Avatar
    tonrogers Posts: 1, Reputation: 1
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    #1

    Feb 20, 2011, 01:51 PM
    Reactants
    18.0 grams of oxygen is reacted with nitrogen to make 56.0 grams of nitrogen dioxide according to the following reaction:
    2O2 + N2 ---> 2 NO2
    How much nitrogen (in grams) reacted?
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #2

    Feb 20, 2011, 06:25 PM
    You say you obtain a total of 56 g of NO2. What does this product consist of? How many grams of each component must be in the product to produce 56 grams?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #3

    Feb 21, 2011, 07:51 AM

    Another way to look at it:
    From your equation, 2 mol of O2 and 1 mol of N2 react to form 2 mol of NO2

    Remember that 1 mol of a substance has a mass equal to the relative mass of the atoms in that substance..
    DrBob1's Avatar
    DrBob1 Posts: 425, Reputation: 86
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    #4

    Feb 21, 2011, 09:38 AM
    To add to my first answer: do you see that you CANNOT get 56 grams of NO2 starting with 18 grams of O2?
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