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Homework Help: Thermochemical equations

  1. 100% the same

  2. calorimetry is a branch of thermochemistry

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  3. thermochemistry is a branch of calorimetry

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  1. Nov 4, 2009 #1
    1. The problem statement, all variables and given/known data
    Why is it so important to show state symbols when writing chemical equations involving enthalpy changes?

    3. The attempt at a solution
    I guess:
    from the thermochemical eqn deltaH=Sigma[H_{f}][products]-Sigma[H_{f}][reactants];
    because the enthalpy of formation of a substance in different states is different,then this serves as a reason to denote the state symbols. Am I correct?monkoej@gmail.com
  2. jcsd
  3. Nov 4, 2009 #2


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    Staff: Mentor

    Heat of evaporation, heat of melting.

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