ΔG When Liquid Water Changes Phase To Vapor At SBP
Strings (SiPjAjk) = S7P7A72 Base Sequence = 12735 String Sequence = 12735 - 7 - 72
What is the ΔG (change in Gibbs free energy) when liquid water changes phase to vapor at 100oC and 1 atm. Molar enthalpy of vaporization is 9720 cal.
S7P7A72 (Dynamic Equilibrium)
Pj Problem of Interest is of type equilibrium (zero Gibbs free energy). This problem can be cast as a change problem but it is not because the primary problem of interest is the equilibrium established when the change in Gibbs free energy is zero. It is in this sense that the primary problem of interest is of type equilibrium.
The equation of interest is:
Change in Gibbs free energy = enthalpy change - T(entropy change)
So, ΔG = ΔH - TΔS -------------(1) where T is temperature in degrees Kelvin.
ΔS = q/T = ΔH/T = 9720/373 cal/mole oK
So, ΔG = 9720 - 373(9720/373) = 0.
A system is in equilibrium when ΔG = 0 and has no usable energy to perform work.
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