Question on: JAMB Chemistry - 2024
A typical chemical reaction will be spontaneous if
A
enthalpy change is negative
B
free energy change is greater than one
C
entropy change is zero
D
enthalpy and free energy change are equal
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Correct Option: A
A spontaneous reaction occurs naturally without any external influence. The spontaneity is determined by the Gibbs free energy change (ΔG), combining enthalpy change (ΔH) and entropy change (ΔS) as follows:
\[\Delta G = \Delta H - T\Delta S\]
A reaction is spontaneous if ΔG is negative. While both ΔH and ΔS contribute to ΔG, the most direct indicator of spontaneity is a negative free energy change. For this question, the most appropriate answer is:
- Enthalpy change is negative: This refers to an exothermic reaction, which can be spontaneous.
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