For the decomposition of one mole of nitrosyl chloride, H = 38 kJ. NOCl(g) NO(g) +

Question:

For the decomposition of one mole of nitrosyl chloride, ΔH = 38 kJ.
NOCl(g) → NO(g) + 1 / 2 Cl2(g)
The activation energy for this reaction is 100 kJ.
a. Is this reaction exothermic or endothermic?
b. What is the activation energy for the reverse reaction?
c. If a catalyst were added to the reaction, how would this affect the activation energy?