[Nemesisof99]

The densities of graphite and diamond are 2.26 and 3.53 g/cc. If the transformation of graphite to diamond takes place at 1.5 X 10^9 Pa at a given temp., the standard free energy change accompanying the process is?

The solution starts with
delta G = - P * delta V

Can you please tell me why?

[Schrödinger]

Do you know any other expression for (in terms of other physical quantities) ?

[Nemesisof99]

delta G = delta H  -  T * delta S

Is P * delta V derived from the above equation?

[Schrödinger]

delta G = delta H  -  T * delta S

Is P * delta V derived from the above equation?

And what other expression do you know for ?

[Nemesisof99]

delta G = delta G⁰ + RT ln K

[savy2020]

delta G = delta G⁰ + RT ln K

Nope, expression for  $$ \Delta H /$$

[Nemesisof99]

Oops!
delta H = delta U + P*delta V

[savy2020]

delta G = delta H  -  T * delta S

Is P * delta V derived from the above equation?

Now put expression for $$ \Delta H /$$ in that for $$ \Delta G /$$ you'll get the reqd.

[Nemesisof99]

That can happen only if delta U = T* delta S?

[savy2020]

Oh yeah,
I don't know how
has come from. May be that is wrong.

But here as .
Is ? I don't think so.