Thermodynamics: Reaction Enthalpy Calculation
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Questions and Answers

What is the standard molar formation enthalpy of a substance?

  • The enthalpy change for the reaction in which a substance is decomposed into its constituent elements.
  • The enthalpy change for the reaction in which a substance is formed from its constituent elements in their standard states. (correct)
  • The enthalpy change for the reaction in which a substance is formed from its constituent elements in any state.
  • The enthalpy change for the reaction in which a substance is completely burned in oxygen.

    • What is the purpose of using standard molar formation enthalpy and standard molar combustion enthalpy?

  • To calculate the standard molar reaction enthalpy. (correct)
  • To calculate the internal energy.
  • To calculate the absolute enthalpy.
  • To calculate the heat capacity.

    • What is the condition for calculating the standard molar reaction enthalpy?

  • The reaction conditions do not matter.
  • The reaction conditions must be identical. (correct)
  • The reaction conditions must be standard.
  • The reaction conditions must be different.

    • What is the unit of standard molar enthalpy?

    <p>kJ/mol</p> Signup and view all the answers

    What is the difference between standard molar formation enthalpy and standard molar combustion enthalpy?

    <p>Formation enthalpy is for reaction with elements, combustion enthalpy is for reaction with oxygen.</p> Signup and view all the answers

    What is the formula to calculate the standard molar reaction enthalpy?

    <p>ΔrHmθ = ΣiΔfHm,iθ - ΣjΔfHm,jθ</p> Signup and view all the answers

    What is the formula to calculate the standard molar combustion enthalpy?

    <p>ΔcHmθ = ΔH1 - ΔH2</p> Signup and view all the answers

    Why is the standard molar combustion enthalpy used?

    <p>Because most organic compounds cannot be directly synthesized from their constituent elements.</p> Signup and view all the answers

    What is the relationship between the standard molar reaction enthalpy and the standard molar formation enthalpy?

    <p>ΔrHmθ = ΣiΔfHm,iθ - ΣjΔfHm,jθ</p> Signup and view all the answers

    What is the unit of ΔrHmθ?

    <p>kJ/mol</p> Signup and view all the answers

    What is the standard state of a substance?

    <p>The state at a standard temperature and pressure</p> Signup and view all the answers

    What is the definition of standard enthalpy change?

    <p>The change in enthalpy at constant temperature and pressure</p> Signup and view all the answers

    What is the unit of standard enthalpy change?

    <p>kJ/mol</p> Signup and view all the answers

    What is the relationship between ΔH and ΔcH?

    <p>ΔH = ΔcH</p> Signup and view all the answers

    What is the purpose of Hess's law?

    <p>To calculate the enthalpy change of a reaction</p> Signup and view all the answers

    What is the definition of bond enthalpy?

    <p>The energy required to break a bond</p> Signup and view all the answers

    What is the difference between ΔH and ΔU?

    <p>ΔH is the change in enthalpy, while ΔU is the change in internal energy</p> Signup and view all the answers

    What is the purpose of Kirchhoff's equation?

    <p>To calculate the enthalpy change of a reaction at different temperatures</p> Signup and view all the answers

    What is the definition of heat capacity?

    <p>The amount of heat required to raise the temperature of a substance by 1°C</p> Signup and view all the answers

    What is the relationship between Cp and Cv?

    <p>Cp = Cv + R</p> Signup and view all the answers

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