[Campbell Biology P.196] The free-energy change ΔG of a chemical reaction is calculated usin... | Practice Question

The free-energy change ΔG of a chemical reaction is calculated using the equation ΔG = ΔH - TΔS. Which of the following correctly identifies the components of this equation?

  • A: ΔG is enthalpy, ΔH is free energy, T is temperature, ΔS is entropy.
  • B: ΔG is free energy change, ΔH is enthalpy change, T is absolute temperature, ΔS is entropy change.
  • C: ΔG is entropy, ΔH is free energy, T is time, ΔS is enthalpy.
  • D: ΔG is temperature, ΔH is entropy, T is free energy, ΔS is enthalpy.

Explanation

The equation ΔG = ΔH - TΔS defines Gibbs free energy change ΔG , enthalpy change ΔH , absolute temperature T , and entropy change ΔS . This relationship is fundamental to predicting the spontaneity of a reaction.