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Molar enthalpy of combustion of magnesium

  1. Mar 3, 2009 #1


    1. The problem statement, all variables and given/known data

    In a calorimeter, a 1.0g sample of magnesium is burned to form MgO. In doing so, 25.5 kJ of energy is released. The molar enthalpy of combustion of magnesium is:

    a) -0.0392 kJ/mol
    b) -25.5 kL/mol
    c) -306.2 kJ/mol
    d) -620 kJ/mol



    2. Relevant equations

    Q= mc DELTA t



    3. The attempt at a solution

    2Mg + O2 --> 2MgO

    .... don't know where to start


    PLEASE! i need help fast
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Mar 4, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    If 1g of magnesium releases 25.5 kJ of energy when burnt, how much energy will be released when 1 mole will be burnt?
     
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