The first reaction is exothermic reaction because it release energy whereas the seocond equation is endothermic reaction due to absorption of energy.
Endothermic Reaction
The energy is absorbed from the surrounding environment in susch type of reaction. Energy is absorbed in the form of heat.
Exothermic Reaction
The energy is released from the reaction to its environment in this type of reaction. Energy is released as heat, electricity, light or sound.
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