Question

3. [10 marks] We've covered the definition of Gibbs free energy, Helmholtz free energy, entropy, and enthalpy. There is also something called their fundamental equations. a) [8 marks] Use online resources and your peers to determine the total differential form of each of these terms. For example, if we're looking at Gibbs free energy, defined as G = H – TS, then determine what dG would be. b) [2 marks] Why is it useful to use this form? c) [+2 bonus] At thermal equilibrium, would each of these values be at a minimum or maximum?

Answer 1

- 1. G=HTS dG = = dH - Tds- s dT dH = Tds+ V dp C from 2nd caw of Thermodynamics -dG = Tdst Vap-Tas-SOT lag- Vap-sdt H = ut pv dH-dut pa v+vap du - Tds-pdv + pd vt vdp. Tost v de This egn can be used to study about the spontanity of the reaction AGCO - Spontaneous Daso Non spontan cous 2. At thermal equilibrium, dT=0 Thus, do becomes maximum. da = V dp