Materials Science and Engineering
Physical Chemistry: Gibbs Energy of Formation
#4.13
"The standard entropy of O2(g) at 298.15K and 1 bar is listed in Appendix C.2 asd 205.138 J K -1, and the standard Gibbs energy of formation is listed as 0 kJ mol-1. Assuming that 02 is an ideal gas, what will the molar entropy and molard Gibbs energy of formation be at 100 bar?"
Molar Entropy: /\S = /\Sº - nRln(P / Pº)
/\S = 205.138 J / (K mol) - 8.3145 (J / K mol) ln (100 bar / 1 bar)
/\S = 166.846 J / (K mol)
Gibbs Energy of Formation: /\Gf = RTln(P / Pº)
/\Gf = 8.3145 J / (K mol) (298.15 K) ln (100 bar / 1 bar)
/\Gf = 11416.8 J / mol