In an endothermic reaction, the value of change in enthalpy (Δ H) is

Question

In an endothermic reaction, the value of change in enthalpy (Δ H) is (A) positive (B) zero (C) negative (D) either (b) or (c)

Tardigrade Admin · Accepted Answer

In endothermic reaction, the enthalpy of reactants is less than the enthalpy of products, since heat is absorbed in endothermic reaction. Therefore, in endothermic reaction change in enthalpy is always positive.

H_{R} A + H_{P} B ⇌ C + D Δ H = + v e

Δ H = H_{P} - H_{R} = + v e (∵ H_{P} > H_{R})

Q. In an endothermic reaction, the value of change in enthalpy (ΔH) is

positive

zero

negative

either (b) or (c)

In endothermic reaction, the enthalpy of reactants is less than the enthalpy of products, since heat is absorbed in endothermic reaction. Therefore, in endothermic reaction change in enthalpy is always positive. HR​A​+HP​B​⇌C+DΔH=+ve ΔH=HP​−HR​=+ve(∵HP​>HR​)

Q. In an endothermic reaction, the value of change in enthalpy $(Δ H)$ is