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Chemistry - enthalpy

  1. Apr 13, 2012 #1
    1. The problem statement, all variables and given/known data


    hydrzine, N2H4 ia a liquid rocket feul. It reacts with oxygen to yeild nitrogen gas and water.

    N2H4 (l)+ O2 (g)--> N2 (g) + 2H2O (l)

    the reaction of 6.50g N2H4 evolves 126.2 kJ of heat. Calculate the enthalpy change per mole of hydrazine combusted




    I am having trouble getting started on this problem. any help with how to solve this problem will be appreciated. Im having trouble with this section :/

    thanks,

    Joe
     
  2. jcsd
  3. Apr 14, 2012 #2

    Borek

    User Avatar

    Staff: Mentor

    This is just about conversion between mass and number of moles.

    6.50 g of hydrazine - how many moles?
     
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