How does temperature affect the spontaneity?

Temperature affects spontaneity through its influence on the Gibbs free energy change (ΔG) of a reaction. A reaction is spontaneous when ΔG is negative, which can be influenced by temperature in the equation ΔG = ΔH - TΔS. If the enthalpy change (ΔH) is positive and the entropy change (ΔS) is also positive, increasing temperature can make ΔG negative, thereby favoring spontaneity. Conversely, if ΔH is negative and ΔS is negative, higher temperatures can lead to a positive ΔG, reducing spontaneity.