Answer to Question #162046 in Physical Chemistry for Eden

Question

Calculate the standard free energy changes for the following reactions at 25°C using the data table

below and using the equation :

ΔG°(rxn) = Ʃ ΔG°f (products) - Ʃ ΔG°f (rectants )

Substance ΔG° f (kJ/mol) S°(J/K·mol

CH 4 (g) -50.8 186.264

CO 2 (g) -394.4 213.74

H 2 O (l) -237.2 109.6

MgO (s) -569.6 26.94

a. CH 4 (g)+ 2 O 2 (g) -> CO 2 (g)+ 2 H 2 O (l)

b. 2MgO(s)-> 2Mg (s) + O 2

2. Using the same chemical reaction in a above, Calculate for ΔS° in J/K .mol

Answer 1

For part 2.

Entropy of O₂ required