state functions

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Karina Koo 2H
Posts: 49
Joined: Fri Sep 28, 2018 12:24 am

state functions

Postby Karina Koo 2H » Mon Feb 11, 2019 1:24 am

can someone explain to me why heat is not a state function? I read the textbook but i still dont get it. Thanks!

Bryant Vong 2G
Posts: 32
Joined: Fri Apr 06, 2018 11:05 am

Re: state functions

Postby Bryant Vong 2G » Mon Feb 11, 2019 1:26 am

This is because it's dependent on the pressure and volume, meaning it can't be a constant value like with a state function.

Jayasuriya Senthilvelan 4I
Posts: 31
Joined: Thu Jan 10, 2019 12:17 am

Re: state functions

Postby Jayasuriya Senthilvelan 4I » Mon Feb 11, 2019 8:55 am

I agree with the above. Heat is like work in that it isn't state function. Its only a state function when there is constant pressure, and heat = enthalpy. Further, heat given off/absorbed by the system is dependent on the pathway taken. See the example in the book on reversible and irreversible isothermal expansion.

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