Thermodynamics and Gibbs Free Energy

The video tutorial covers Gibbs free energy, entropy, and enthalpy, providing definitions and explaining their significance in thermodynamics. It discusses the units and signs associated with these concepts and their implications for spontaneity. The tutorial includes practice problems to illustrate the calculation of Gibbs free energy, both at standard temperature and pressure (STP) and at equilibrium, using the Haber process as an example.

What is the primary role of Gibbs Free Energy in a chemical reaction?

• To calculate the pressure of the system

• To determine the spontaneity of the reaction

• To measure the temperature of the reaction

• To find the volume of the reactants

Which of the following is true about a reaction with a positive Gibbs Free Energy?

• The reaction is spontaneous at all temperatures

• The reaction has reached equilibrium

• The reaction is non-spontaneous at any temperature

• The reaction is exothermic

What does a positive value of entropy indicate about a system?

• The system is at equilibrium

• The system is non-spontaneous

• The system has increased disorder

• The system is more ordered

What is the unit of measurement for entropy?

• Joules per mole

• Kelvin

• Joules per mole Kelvin

• Kelvin per mole

In the practice problem, what is the significance of multiplying the enthalpy of nitrogen monoxide by two?

• To find the equilibrium constant

• To balance the chemical equation

• To convert the units to Kelvin

• To account for the number of moles in the reaction

How is the enthalpy change calculated in a chemical reaction?

• By subtracting the enthalpy of reactants from products

• By dividing the enthalpy of products by reactants

• By multiplying the enthalpy of reactants and products

• By adding the enthalpy of reactants and products

In the context of the video, what does STP stand for?

• Standard Time and Power

• Standard Temperature and Power

• Standard Time and Pressure

• Standard Temperature and Pressure

What is the Gibbs Free Energy change for a reaction at equilibrium?

• Undefined

• Positive

• Negative

• Zero

What is the value of the natural log of 1, as used in the equilibrium calculation?

• Negative infinity

• Infinity

• 1

• 0

Which constant is used in the calculation of Gibbs Free Energy related to equilibrium?

• Boltzmann constant

• Universal gas constant

• Planck's constant

• Avogadro's number