Distinguish between Endothermic reaction and Exothermic reaction.

1.	Distinguish between Endothermic reaction and Exothermic reaction.
Answer» Endothermic reaction : In endothermic reaction heat is absorbed from suroundings. Sum of enthalpies of products is greater than sum of enthalpies of reactants i.e. ΣPH > ΣRH Heat of reaction, ΔH is positive. Products are less stable than reactants. C_(s) + O_2(g) → CO_2(g) ΔH = -394 kJ This reaction requires supply of thermal energy. Exothermic reaction : In exothermic reaction heat is given out to surroundings. Sum of enthalpies of products is less than sum of enthalpies of reactants. i.e. Σ_PH < Σ_RH Heat of reaction, ΔH is negative. Products are more stable than reactants. N_2(g) + O_2(g) → 2NO ΔH = + 180 kJ This reaction does not require supply of thermal energy.

Answer»

Endothermic reaction :

In endothermic reaction heat is absorbed from suroundings.
Sum of enthalpies of products is greater than sum of enthalpies of reactants i.e. ΣPH > ΣRH
Heat of reaction, ΔH is positive.
Products are less stable than reactants. C_(s) + O_2(g) → CO_2(g) ΔH = -394 kJ
This reaction requires supply of thermal energy.

Exothermic reaction :

In exothermic reaction heat is given out to surroundings.
Sum of enthalpies of products is less than sum of enthalpies of reactants. i.e. Σ_PH < Σ_RH
Heat of reaction, ΔH is negative.
Products are more stable than reactants.
N_2(g) + O_2(g) → 2NO ΔH = + 180 kJ
This reaction does not require supply of thermal energy.

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Distinguish between Endothermic reaction and Exothermic reaction.

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