Question

derive an expression for the effect of temperature on the heat of reaction at constant pressure

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Answer 1

The heat of the chemical reaction at constant pressure is called Enthalpy.

Enthalpy (H) according to the definition

∆H = E + PV

• H = State function ( Enthalpy)
• q = Is the heat absorbed or evolved by the reaction at constant pressure
• w = work done by the system

As we know , ∆E = q + w

And w = - P∆V

By substituting these equation in Enthalpy expression

∆H = E + PV

∆H = (q + w) - w

∆H = q + w - w

∆H = q

Therefore, at constant pressure, the heat gained or loss is equal to change in Enthalpy.

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