CBSENEETJEEClass 11
What is enthalpy?
Answer
Enthalpy (H) is the total heat content of a system at constant pressure, defined as H = U + PV, where U is internal energy.
The working
Definition
Enthalpy is a thermodynamic state function representing the heat content of a system measured at constant pressure.
Formula
It is given by H = U + PV, where U is internal energy, P is pressure, and V is volume.
Change in enthalpy
At constant pressure, the heat absorbed or released equals the enthalpy change, ΔH = qp.
Sign convention
ΔH is negative for exothermic reactions (heat released) and positive for endothermic reactions (heat absorbed).
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