CHEM 1002 Lecture 1: Entropy and Spontaneity Tutorial
17 Jan 2015
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Thus, when a change occurs, the change in entropy (d s) may be either positive or negative. A positive d s is a favorable change, i. e. one which tends to make the change spontaneous. Recall that a negative d h (i. e. heat released, an exothermic reaction) is also a favorable situation, Recall that a negative d h (i. e. heat released, an exothermic reaction) is also a favorable situation, i. e. one which tends to make the reaction spontaneous. Thus, a reaction that has both a negative. D h and a positive d s will be spontaneous no matter what the temperature is. In order to quantify these effects so as to be able to predict whether or not a reaction will be spontaneous, we need to use the change in free energy, d g, for the reaction. Co2(g) + 2 h2o ch4(g) + 3 o2(g)
