Join thousands of students who trust us to help them ace their exams!Watch the first video
Multiple Choice
Which part of the equation ΔG = ΔH – TΔS tells you if a process is spontaneous?
A
ΔH
B
ΔS
C
TΔS
D
All of these values reveal the direction in which a reaction will go.
E
ΔG
Verified step by step guidance
1
Understand the equation: The equation \( \Delta G = \Delta H - T\Delta S \) is used to determine the spontaneity of a process. Here, \( \Delta G \) represents the change in free energy, \( \Delta H \) is the change in enthalpy, \( T \) is the temperature in Kelvin, and \( \Delta S \) is the change in entropy.
Identify the role of \( \Delta G \): The value of \( \Delta G \) indicates whether a process is spontaneous. If \( \Delta G < 0 \), the process is spontaneous. If \( \Delta G > 0 \), the process is non-spontaneous. If \( \Delta G = 0 \), the system is at equilibrium.
Analyze the components: \( \Delta H \) and \( \Delta S \) are important in determining \( \Delta G \), but they do not directly tell you if a process is spontaneous. They contribute to the calculation of \( \Delta G \).
Consider the temperature effect: The term \( T\Delta S \) shows how temperature affects the entropy change's contribution to \( \Delta G \). A higher temperature can make the \( T\Delta S \) term more significant, potentially affecting the spontaneity.
Conclude with \( \Delta G \): Ultimately, it is the value of \( \Delta G \) that directly tells you if a process is spontaneous, as it combines the effects of enthalpy, entropy, and temperature into a single value.