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Chemistry 1 mark mcq question on enthalpy change of atomisation of hydrazine? help!

  1. Apr 24, 2012 #1
    1. The problem statement, all variables and given/known data

    Hydrazine was used as a fuel for the Messerschmidt 163 rocket fighter in World War II and for the
    American Gemini and Apollo spacecraft.

    What is the enthalpy change of atomisation of 1 mol of gaseous hydrazine?
    A 550 kJ
    B 1720 kJ
    C 1970 kJ
    D 2554 kJ
    Use of the Data Booklet is relevant to this question


    2. Relevant equations



    3. The attempt at a solution

    Is my equation correct?
    N2(g) + 2H2(g) → N2H4(g)

    The bond enthalpy for the N2(triple bond) in the data book let is 994. H2 is 436. N-N is 160 and N-H is 390 (if you need other bond enthalpies from the data booklet Il be happy to provide them)
    I know that one of the ways to find the enthalpy change is Ʃ(bond breaking energy) - Ʃ(bond making energy). So i got 1866-1720= 146J/mol. Which is NOT IN THE OPTION!!
     
  2. jcsd
  3. Apr 25, 2012 #2

    Borek

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    Staff: Mentor

    Re: Chemistry 1 mark mcq question on enthalpy change of atomisation of hydrazine? hel

    What is "atomization"?
     
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