Reaction pathway A is exothermic. neither exothermic nor endothermic. endothermic. Reaction pathway B is exothermic. neither exothermic nor endothermic. endothermic. Which reaction pathway has the faster rate of reaction and why? Reaction pathway B has the faster rate because the products have less energy than the products of reaction pathway A. Reaction pathway A has the faster rate because the products have more energy than the products of reaction pathway B. Reaction pathway B has the faster rate because the activation energy is smaller than the activation energy of reaction pathway A. Reaction pathway A has the faster rate because the activation energy is greater than the activation energy of reaction pathway B. Which reaction pathway has the larger heat of reaction, Δ H rxn ? ΔHrxn?