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Grade: 12th pass
        
why is change in enthalpy equal to heat absorbed by the system at constant pressure?
2 months ago

Answers : (1)

Arun
20280 Points
							

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)

 
2 months ago
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