Give the balanced equation for the reaction: formation of 1 mol nitrogen dioxide from its elements (heat is absorbed) a. N2(g) + 2O2(g) + heat => 2NO2(g) b. N2(g) + 2O2(g) => 2NO2(g) + heat c. 1/2 N2(g) + O2(g) => NO2(g) + heat d. 1/2 N2(g) + O2(g) + heat => NO2(g) e. None of these