The U. S. requires automobile fuels to contain a renewable component. The fermentation of glucose from corn produces ethanol, which is added to gasoline to fulfill this requirement: C6H12O6(s) → 2 C2H5OH(l) + 2 CO2(g) Calculate ΔH o , ΔS o and ΔG o for the reaction at 25°C. Is the spontaneity of this reaction dependent on temperature?

Explanation:

The chemical equation for the reaction is :

The standard enthalpy of formation  of the above equation is as follows:

= -1274.4 kJ/mol

= -277.7 kJ/mol

= -393.5 kJ/mol

where ;

= stochiometric coefficients of products

stochiometric coefficients of reactants

= formation standard enthalpy of products

= formation standard enthalpy of reactants

For ;

The standard enthalpy of formation of of the reactant and the products are :

The is as follows:

  (to kJ/K)

Given that;

at T = 25°C = ( 25 + 273) K = 298 K

As is negative; the reaction is spontaneous

= negative

= positive; Therefore , the reaction is spontaneous at all temperature , We can then say that the spontaneity of this reaction  is dependent on temperature.