Question

Part A Part complete ΔH∘rxn=+ 83 kJ , ΔSrxn=+ 146 J/K , T= 309 K Express your answer as an integer. -- Part B Part complete ΔH∘rxn=+ 83 kJ , ΔSrxn=+ 146 J/K , T= 759 K Express your answer as an integer. -- ΔG Δ G = kJ Part C Part complete ΔH∘rxn=+ 83 kJ , ΔSrxn=− 146 J/K , T= 309 K Express your answer as an integer. -- ΔG Δ G = nothing kJ Part D Part complete ΔH∘rxn=− 83 kJ , ΔSrxn=+ 146 J/K , T= 407 K Express your answer as an integer. -- ΔG Δ G = nothing kJ SubmitPrevious AnswersRequest Answer Part E Complete previous part(s) Part F Complete previous part(s) Part G Complete previous part(s) ΔG Δ G = nothing kJ

Answer 1

Gibb's free energy (G) is a thermodynamic quantity which is an indication of maximum amount of useful work that can be done.

Mathematically it is expressed as

G = H - TS

Hence change in Gibb's free energy is

G = H - (TS)

If Temperature is constant then

G = H - TS

PART A:

H = 83 KJ = 83000 J

S = 146 J/K , T = 309 K

G = 83000 - 146*309 = 37886 J = 37.886 KJ = 38 KJ (ROUND FIGURE TO INTEGER)

PART B:

H = 83 KJ = 83000 J

S = 146 J/K , T = 759 K

G = 83000 - 146*759 = -27814 J = -27.814 KJ = - 28 KJ

PART C:

H = 83 KJ = 83000 J

S = -146 J/K , T = 309 K

G = 83000 - (-146)*309 = 128114 J = 128.114 KJ = 128 KJ

PART D:

H = - 83 KJ = - 83000 J

S = 146 J/K , T = 407 K

G = - 83000 - 146*407 = -142422 J = -142.422 KJ = -142 KJ

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