Van't Hoff Isotherm

Van't Hoff Isotherm

Van't Hoff Isotherm

Van't Hoff Isotherm

Van't Hoff Isotherm is a quantitative relation of free energy change accompanying a chemical reaction and it directs the direction of a particular reaction.
Let us consider a chemical reaction-
aA + bB ⇌ cC + dD
where a, b, c and d are the number of moles of A, B, C and D respectively.
We know that free energy per mole is given as-
F = Fo + RT lnP
If the free energy per mole of A, B, C and D be FA, FB, FC and FD at the respective pressures PA, PB, PC and PD and their standard free energies be FoA, FoB, FoC and FoD. Then-
FA = FoA + RT lnPA
FB = FoB + RT lnPB
FC = FoC + RT lnPC
FD = FoD + RT lnPD
Now the free energy change of a chemical reaction is given as-
ΔF = ΣΔFProduct − ΣΔFReactant
or, ΔF = cFC + dFD − aFA + bFB
Hence-
Van't Hoff Isotherm
This equation is known as Van't Hoff Isotherm.

Van't Hoff Isochore


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