Given the following unbalanced reaction and thermodynamics infromation, what is deltaGknot rxn at 85 degrees Celcius....

Given the following unbalanced reaction and thermodynamics infromation, what is deltaGknot rxn at 85 degrees Celcius. Please report your answer in kj/mol and to the correct number of significant figures.

C2H6 (g) + O2 (g) --> CO2 (g) + H2O (g)

deltaH values (kJ/mol): C2H6 (g) = -83.9; CO2 (g) = -394; H2O (g) = -242

deltaS values (J/mol): C2H6 (g) += 229; CO2 (g) = 214; H2O (g) = 189; O2 (g) =206

Side note: My answer was -2892.42, however it was wrong.

Expert Solution

C₂H₆ (g) + O₂ (g) CO₂ (g) + H₂O (g)

Balance the given reaction. On balancing we get:

C₂H₆ (g) + 7/2 O₂ (g) 2 CO₂ (g) + 3 H₂O (g)

G^o = H^o - TS^o

H^o =H^o products - H^o reactants = [(-394 x 2) + (-242 x 3)] - [(-83.9)+0] = -1514 + 83.9 = -1430.1 Kj/mol

S^o =S^o products - S^o reactants = [(214x 2) + (3 x 189)] - [229+ (7/2 x 206)] = 428 + 567 - 950 = 45 KJ/mol

T = 85 + 273 = 358 K

G^o = H^o - TS^o = -1430.1 - (358 x 45) = - 17540.1 KJ/mol

queen_honey_blossom answered 2 years ago

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