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Homework Help: My brother's assignment

  1. Nov 23, 2011 #1
    1. The problem statement, all variables and given/known data
    What weight of O2 in grams will be required to react with exactly 100 grams of NH3 ascending to the eq.

    2. Relevant equations

    I think none.

    3. The attempt at a solution
    I don't have any attempt on this problem because my brother only ask for my assistance regarding this assignment and he too doesn't know how to start this problem- the fact that it is under their next lesson.

    I just wanna help my brother, so I risk to post it here. I hope somebody would help me and will explain how the solution goes so that i can relay it to him. Thanks :)
  2. jcsd
  3. Nov 23, 2011 #2

    First of all the equation needs to be balanced ( there are more hydrogens on the left than the right). Then you need to calculate the number of moles 100g of ammonia contains. Then using the stoichiometry of the reaction use that to calculate the equivilant number of moles of oxygen required to react with that many moles of ammonia. Using moles=grams/mr you can calculate the weight of oxygen needed. Post back in this thread if you get stuck

  4. Nov 23, 2011 #3
    thanks for your speedy reply! :D
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