Delta G at Boiling Point






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donnanguyen1d
Posts: 64
Joined: Fri Sep 29, 2017 7:04 am

Delta G at Boiling Point

Postby donnanguyen1d » Sun Mar 11, 2018 10:35 am

why is gibbs free energy zero at 100 boiling point (number 9.91)

Tasnia Haider 1E
Posts: 55
Joined: Sat Jul 22, 2017 3:01 am

Re: Delta G at Boiling Point

Postby Tasnia Haider 1E » Sun Mar 11, 2018 11:13 am

At boiling point, the change in temperature is zero so change in enthalpy is also zero (infer that pressure is constant so W=0). Since change in enthalpy is zero, we also want change in entropy to be zero. This happens when W=0.

Shanmitha Arun 1L
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Re: Delta G at Boiling Point

Postby Shanmitha Arun 1L » Sun Mar 11, 2018 1:40 pm

At boiling point, temperature and pressure are constant. Therefore, the change in enthalpy would be zero.

Pooja Nair 1C
Posts: 55
Joined: Thu Jul 13, 2017 3:00 am

Re: Delta G at Boiling Point

Postby Pooja Nair 1C » Fri Mar 16, 2018 12:44 am

If you remember the graph of phase transitions, as a phase transition is about to occur, energy is still supplied to the system but temperature doesn't change immediately. Thus, at the point of a phase transition, such as the boiling point, there is no change in temperature. As delta G is a factor of change in temperature, delta G = 0 at the boiling point.


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