Enthalpy of Formation and Thermodynamics Quiz
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Questions and Answers

Which of the following best defines the standard enthalpy of formation?

  • The change in enthalpy when 1 mole of a compound is formed from its constituent elements in their reference state (correct)
  • The change in enthalpy when 1 mole of a compound is formed from its constituent elements in their standard states
  • The change in enthalpy when 1 mole of a compound is formed from its constituent elements at standard temperature and pressure
  • The change in enthalpy when 1 mole of a compound is formed from its constituent elements at 25°C or 298.15 K

    • What is the recommended standard pressure value for the standard enthalpy of formation?

  • 1.00 atm
  • 100 kPa
  • 105 Pa
  • 1 bar (correct)

    • What does the superscript Plimsoll on the symbol ΔfH⦵ indicate?

  • The process has occurred under standard conditions at any temperature
  • The process has occurred under non-standard conditions at any temperature
  • The process has occurred under standard conditions at the specified temperature (correct)
  • The process has occurred under non-standard conditions at the specified temperature

    • What is the standard state for a gas in the context of standard enthalpy of formation?

    <p>The state the gas would assume if it obeyed the ideal gas equation at a pressure of 1 bar</p> Signup and view all the answers

    What is the standard state for a gaseous or solid solute present in a diluted ideal solution in the context of standard enthalpy of formation?

    <p>The hypothetical state of concentration of the solute of exactly one mol</p> Signup and view all the answers

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