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Homework Help: 0.75 moles of NH3 molecules contain how many moles of hydrogen?

  1. Feb 7, 2010 #1
    1. The problem statement, all variables and given/known data


    0.75 moles of NH3 molecules contain how many moles of hydrogen????
    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 7, 2010 #2
    Re: Help

    You can use ratios, so in NH3 you have:

    number of Nitrogen atoms : number of Hydrogen atoms = n(N) : n(H) = 1 : 3

    Therefore, for each mole of Nitrogen atoms you have 3 moles of Hydrogen atoms

    As such, when you have 0.75 mol of NH3 molecules this means there is 0.75 mol of Nitrogen atoms (ie: n(N) = 0.75), and therefore the n(H) = 3 * 0.75 = 2.25mol.
     
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