Calculate the Gibbs free energy change for the following balanced molecular equation at 180°C. N2(g) + 2 O2(g)
2 NO2(g)

Carbons 1 and 4 of 1,3−cyclopentadiene are equivalent and give the same carbocation on protonation. likewise, carbons 2 and 3 are equivalent. write the structure of the carbocation formed by protonation of c−2 or c−3 to verify that it is not allylic and therefore not as stable as the one formed by protonation of c−1 or c−4.