Yeast can produce ethanol by tire fermentation of glucose (C_6H_12O_6), which is

Question

Yeast can produce ethanol by tire fermentation of glucose (C_6H_12O_6), which is the basis for the production of most alcoholic beverages. C_6H_12O_6(aq) rightarrow 2 C_2H_5OH(l) + 2CO_2(g) Calculate Delta_r H degree, Delta_r S degree, and Delta_r G degree for the reaction at 25 degree C. Thermodynamic Data: Species Delta_f H degree(kJ/mol) S degree (J/K middot mol) Delta_f G degree (kJ/mol) C_6H_12O_6(aq) - 1260.0 289.0 -918.8 C_2H_5OH(l) -277.0 160.7 -174.7 CO_2(g) -393.509 213.74 -394.359 Delta_r H degree = __________ kJ Delta_r S degree = _________ J/K Delta_r G degree = _________ kJ

Explanation / Answer

Q1.

dHRxn = Hproducts - Hreactants

dHRxn = (-2777 + 2 *-393.509 ) - (-1260.0) = -2304.018 kJ/mol

For

dSRxn = Sproducts - Sreactants

dSRxn = (160.7+ 2 *289) - (213.74) =524.96  J/mol

finally

dGRxn = Gproducts - Greactants

dGRxn = (-174.7+ 2 *-393.359) - (-918.8) = -42.618 J/mol

this will be spontaneous

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