Question

Nitric oxides, and , contribute to air pollution, acid rain, and the depletion of the ozone layer. After forms in the combustion chamber of an automobile engine, it reacts further with oxygen to form . The reaction is given by The following table gives some entropy values: 240.0 205.2 210.8 1 calcu;ate the (delta)S rxn for the reaction: 2NO+O2>>>2NO2

Answer 1

Write the reaction as follows Calculate the change in entropy of the reaction as follows AS-AS(products)-AS(reactants 2 (240.0)-2(210.65)-205.0 J/molK --146.3J/molK Hence the required entropy change is -146.3 J/molK