Chemistry Practice Problems Entropy Practice Problems Solution: Nitric oxides, NO and NO2, contribute to air pollu...

Solution: Nitric oxides, NO and NO2, contribute to air pollution, acid rain, and the depletion of the ozone layer. After NO forms in the combustion chamber of an automobile engine, it reacts further with oxygen to form NO2. The reaction is given by2NO (g) + O2 (g) → 2NO2 (g) The following table gives some entropy values: Part ACalculate ΔS°rxn for the reaction 2NO (g) + O2 (g) → 2NO2 (g) Express your answer to one decimal place and include the appropriate units. Part BA negative change in entropy indicates that (i) the products are more disordered than the reactants (ii) the products are less disordered than the reactants

Problem

Nitric oxides, NO and NO2, contribute to air pollution, acid rain, and the depletion of the ozone layer. After NO forms in the combustion chamber of an automobile engine, it reacts further with oxygen to form NO2. The reaction is given by

2NO (g) + O2 (g) → 2NO2 (g) 

The following table gives some entropy values: 

Part A

Calculate ΔS°rxn for the reaction 

2NO (g) + O2 (g) → 2NO2 (g) 

Express your answer to one decimal place and include the appropriate units. 

Part B

A negative change in entropy indicates that 

(i) the products are more disordered than the reactants 

(ii) the products are less disordered than the reactants

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