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Homework Help: Multiple Choice Question about Enthalpy of Formation

  1. Mar 29, 2015 #1
    1. The problem statement, all variables and given/known data

    The term chlorine is used to mean a number of possible types of matter containing chlorine atoms, such as Cl2(g), Cl(g), and Cl-(aq). Which of these forms of chlorine would have a zero standard enthalpy of formation?

    a) Cl2(g), Cl(g), and Cl-(aq)

    b) Cl(g)

    c) Cl-(aq)

    d) Cl2(g)

    e) Cl2(g), Cl(g)

    2. Relevant equations

    Enthalpy of Formation for Elements = 0KJ

    3. The attempt at a solution

    Really not sure where to begin, but the answer in the back of the book is d), and I can't understand why it's like that. Shouldn't it be a), since the enthalpy of formation for elements is always 0KJ
  2. jcsd
  3. Mar 30, 2015 #2


    User Avatar

    Staff: Mentor

    Can you quote the definition of a standard state as was given to you?
  4. Apr 8, 2015 #3
    What is the standard state of Chlorine? (Hint: standard state for pure liquids/gas is...)
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