Two reactions have the following potential-energy data (values per mole):
• Reaction A: reactants 150 kJ, transition state 260 kJ, products 90 kJ
• Reaction B: reactants 150 kJ, transition state 210 kJ, products 130 kJ
(i) Indicate which reaction releases more heat to the surroundings.
(ii) Indicate which reaction proceeds with the greater activation energy.
Support each choice with a brief numerical comparison.