Standard Enthalpy of Formation - Key Concepts For Doing Enthalpy Calculations

Key Concepts For Doing Enthalpy Calculations

  1. When a reaction is reversed, the magnitude of ΔH stays the same, but the sign changes.
  2. When the balanced equation for a reaction is multiplied by an integer, the corresponding value of ΔH must be multiplied by that integer as well.
  3. The change in enthalpy for a reaction can be calculated from the enthalpies of formation of the reactants and the products
  4. Elements in their standard states are not included in the enthalpy calculations for the reaction since the enthalpy of an element in its standard state is zero.

Read more about this topic:  Standard Enthalpy Of Formation

Famous quotes containing the words key, concepts and/or calculations:

    “The word “forbearance” is the key to a happy home.”
    —Chinese proverb.

    “When you have broken the reality into concepts you never can reconstruct it in its wholeness.”
    —William James (1842–1910)

    “He who is conversant with the supernal powers will not worship these inferior deities of the wind, waves, tide, and sunshine. But we would not disparage the importance of such calculations as we have described. They are truths in physics because they are true in ethics.”
    —Henry David Thoreau (1817–1862)