|This applet shows how to predict
reaction spontaneity based on standard enthalpy and entropy values.
Values which promote spontaneity (i.e. negative enthalpy, positive
entropy) are shown in green, while resisting values (i.e. positive
enthalpy, negative entropy) are shown in red.
Reaction 1 is exothermic but reduces entropy, making it spontaneous at low temperatures, but not at high temperatures. Reaction 2 is endothermic and decreases entropy, and is therefore not spontaneous at any temperature. Reaction 3 is exothermic and causes an increase in entropy, making it spontaneous at all temperatures.
Things to consider: