An important atmospheric chemistry process in the production of smog is the reaction of gaseous nitric oxide (NO
) with oxygen to form nitrogen dioxide (NO2
) via the reaction 2NO(g)+O2(g)→2NO2(g)
. In this reaction, the enthalpy change is -117 kJ/mol
and the entropy change is -153 J/mol⋅K
.
Part A
Below what temperature in ∘C
is this reaction spontaneous? Assume that the enthalpy and entropy changes are independent of temperature.