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heat and state function

Posted: Fri Jan 08, 2016 11:28 am
by Jasmine Lam 1I
Why is heat not a state function but enthalpy is?
What are state functions?
Thanks :)

Re: heat and state function

Posted: Fri Jan 08, 2016 11:35 am
by Charlene Tang 1B
Heat is not a state function because it depends on the pressure during heating/cooling and not just the initial and final temperatures and pressure, while enthalpy is measured at constant pressure.

State functions are step independent functions and only the initial and the final values matter, not the steps.

Hope that helps!

Re: heat and state function

Posted: Fri Jan 08, 2016 11:43 am
by Shrita Pendekanti 4B
A state function describes the equilibrium state of a system. In this case, enthalpy describes a thermodynamic system, irrespective of the paths each part of the system took to arrive at its current state. Heat is not a state function because it is a form of energy being transitioned as a cause of change (think of it as part of one of the paths you're allowed to ignore). Hope this helps!