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

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

AIIMSAIIMS 1998Thermodynamics

Solution:

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.
$\underset{H_R}{A} + \underset{H_P}{B} \rightleftharpoons C + D \Delta H =+ ve$
$\Delta H=H_P-H_R=+v e\left(\because H_P>H_R\right)$