Question

The activation energy for the reaction a2(g) 1 b2(g) 88n 2ab(g) is 167 kj/mol, and de for the reaction is 128 kj/mol. what is the activation energy for the decomposition of ab?
A. 39 kJ/mol
B. 39 kJ
C. 167 kJ/mol
D. 128 kJ/mol