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heat will be absorbed and the products will be formed faster exothermic reaction will undergo spontaneously as it does not require any energy while endothermic reaction has to be supplied with energy to happen therefore exothermic reaction will be faster than endothermic reaction
Effect of temperature on percentage yield of ammonia. In the Haber process, the forward reaction is exothermic and the backward reaction is endothermic. If the temperature is decreased, the yield from the exothermic direction is increased. However, by decreasing the temperature the molecules move more slowly and collide less frequently. This lowers the rate of reaction.