Entropy of Reaction for Nitrogen Dioxide Formation Nitric oxides. NO and NO_2, c

Question

Entropy of Reaction for Nitrogen Dioxide Formation Nitric oxides. NO and NO_2, 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 NO_2. The reaction is given by 2NO(g) + O_2(g) implies 2NO_2(g) The following table gives some entropy values: Substance S degree (J/mol middot K) NO_2 240.0 O_2 205.2 NO 210.8 Calculate Delta S_rxn degree for the reaction 2NO(g) + O_2(g) implies 2NO_2(g) Express your answer to one decimal place and include the appropriate units.

Explanation / Answer

SRxn = Sprod - Sreact = 2*240 - (2*210.8 + 205.2) = -146.8 J/molK

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