Nitrogen Dioxide , a pollutant in the atmosphere, can combine with water to form nitric acid. One of the possible reactions is shown here. Calculate delta ∆G° and Kp for this reaction at 25°C and comment on the spontaneity of the reaction. 3NO2(g)+H2O(l)-- 2 HNO3(aq)+ NO (g).

Question

Nitrogen Dioxide , a pollutant in the atmosphere, can combine with water to form nitric acid. One of the possible reactions is shown here. Calculate delta ∆G° and Kp for this reaction at 25°C and comment on the spontaneity of the reaction. 3NO2(g)+H2O(l)--> 2 HNO3(aq)+ NO (g). 
Temp     Kp
170 K   3.8x 10^-3
180 K   0.34
190 K   18.4
200 K   681

DrBob222 · Answer

dGorxn = (n*dGo products) - (dGo products) dGo = -RT*lnK Solve for K @ 298 and comment on spontaneity.