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7-8 Standard Enthalpies of Formation

Learn about the enthalpy changes in forming substances, standard states, and reactions. Worked examples provided.

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7-8 Standard Enthalpies of Formation

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  1. 7-8 Standard Enthalpies of Formation Hf° • The enthalpy change that occurs in the formation of one mole of a substance in the standard state from the reference forms of the elements in their standard states. • The standard enthalpy of formation of a pure element in its reference state is 0.

  2. Standard States

  3. Standard Enthalpy of Formation

  4. Standard Enthalpies of Formation

  5. Standard Enthalpies of Reaction H overall = -2Hf°NaHCO3+ Hf°Na2CO3 +Hf°CO2 + Hf°H2O

  6. Enthalpy of Reaction Hrxn = Hf°products- H f°reactants

  7. Table 7.3 Enthalpies of Formation of Ions in Aqueous Solutions

  8. Worked Examples Follow:

  9. Try these end of chapter problems starting on page 266: • # 1, 5, 9, 11, 19, 25, 29, 35, 39, 45, 51, 55, 57, 59, 65, 69, 71, 75, 113, 114, 116, 117

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