The figure below represents the spontaneous reaction of H 2 (shaded spheres)with O 2 (unshaded spheres)to produce gaseous H 2 O.
-How will the spontaneity of this reaction vary with temperature? This reaction is

Question

The figure below represents the spontaneous reaction of H 2 (shaded spheres)with O 2 (unshaded spheres)to produce gaseous H 2 O. 
-How will the spontaneity of this reaction vary with temperature? This reaction is

Quizplus · Accepted Answer

The spontaneity of a reaction can be determined by the Gibbs free energy change ($\Delta G$), which is related to the enthalpy change ($\Delta H$) and the entropy change ($\Delta S$) of the reaction by the equation $\Delta G = \Delta H - T\Delta S$. If $\Delta H$ is positive and $\Delta S$ is negative, the reaction tends to be nonspontaneous at high temperatures (because the $T\Delta S$ term, which is negative, becomes more significant and increases $\Delta G$) and spontaneous at low temperatures (because the $T\Delta S$ term has less impact, making $\Delta G$ potentially negative if $\Delta H$ is not too large).

The Figure Below Represents the Spontaneous Reaction of H2 (Shaded

The Figure Below Represents the Spontaneous Reaction of H₂ (Shaded