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why is change in enthalpy equal to heat absorbed by the system at constant pressure?

why is change in enthalpy equal to heat absorbed by the system at constant pressure?

Grade:12th pass

1 Answers

Arun
25763 Points
2 years ago

If you see from the first law of thermodynamics,

del Q=dU+del W

where

Q is heat interaction, U is internal energy and W is the work done.

For a closed system,

del Q= dU+ PdV …..(1)

As we know from the definition of enthalpy,

H=U+PV

For change in enthalpy for constant pressure,

dH=dU+PdV ….(2)

So comparing the equations 1 and 2 we get,

del Q= dH

So, change in enthalpy is equal to heat interaction for a constant pressure process.

 

Regards

Arun (askIITians forum expert)

 

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