20 Questions
What is the standard molar formation enthalpy of a substance?
The enthalpy change for the reaction in which a substance is formed from its constituent elements in their standard states.
What is the purpose of using standard molar formation enthalpy and standard molar combustion enthalpy?
To calculate the standard molar reaction enthalpy.
What is the condition for calculating the standard molar reaction enthalpy?
The reaction conditions must be identical.
What is the unit of standard molar enthalpy?
kJ/mol
What is the difference between standard molar formation enthalpy and standard molar combustion enthalpy?
Formation enthalpy is for reaction with elements, combustion enthalpy is for reaction with oxygen.
What is the formula to calculate the standard molar reaction enthalpy?
ΔrHmθ = ΣiΔfHm,iθ - ΣjΔfHm,jθ
What is the formula to calculate the standard molar combustion enthalpy?
ΔcHmθ = ΔH1 - ΔH2
Why is the standard molar combustion enthalpy used?
Because most organic compounds cannot be directly synthesized from their constituent elements.
What is the relationship between the standard molar reaction enthalpy and the standard molar formation enthalpy?
ΔrHmθ = ΣiΔfHm,iθ - ΣjΔfHm,jθ
What is the unit of ΔrHmθ?
kJ/mol
What is the standard state of a substance?
The state at a standard temperature and pressure
What is the definition of standard enthalpy change?
The change in enthalpy at constant temperature and pressure
What is the unit of standard enthalpy change?
kJ/mol
What is the relationship between ΔH and ΔcH?
ΔH = ΔcH
What is the purpose of Hess's law?
To calculate the enthalpy change of a reaction
What is the definition of bond enthalpy?
The energy required to break a bond
What is the difference between ΔH and ΔU?
ΔH is the change in enthalpy, while ΔU is the change in internal energy
What is the purpose of Kirchhoff's equation?
To calculate the enthalpy change of a reaction at different temperatures
What is the definition of heat capacity?
The amount of heat required to raise the temperature of a substance by 1°C
What is the relationship between Cp and Cv?
Cp = Cv + R
Calculate the reaction enthalpy of 2C(s)+2H2(g)+O2(g)=CH3COOH(l) at 298K using given thermodynamic data. Practice thermodynamics problems with a focus on reaction enthalpy, heat, and internal energy.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
