The [tex]2NH_{3} (g)[/tex]→ [tex]N_{2} (g) + 3H_{2} (g)[/tex] is endothermic reaction because ΔH > 0.
Any process that causes the system's enthalpy H to rise would be an endothermic one. A closed system typically accumulates thermal heat from the environment during such a procedure, which causes heat exchange in the system.
In the existence of chlorophyll as well as sunlight, green plants engage in photosynthesis, an endothermic mechanism that transforms carbon dioxide but also water into glucose as well as oxygen.
It can be seen that in given reaction ΔH > 0.thats why it will be endothermic reaction.
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