a. Define reaction Gibbs energy and state its units. On a sketch diagram shoe ho

Question

a. Define reaction Gibbs energy and state its units. On a sketch diagram shoe how the reaction Gibbs energy varies with extent of reaction. State the condition under which a reaction attains equilibrium.

b. (i)    Calculate Kp at 298.15 K for the reaction:

CO (g) + H2O (l) <-> CO2 (g) + H2 (g); based on this result comment on the equilibrium composition of the mixture at 298.15 K

(ii) Calculate the equilibrium constant of the above reaction at T2 = 100oC, given that standard reaction enthalpy is 2.85 kJ/mol.

Explanation / Answer

Gibbs energy is defined as follows:

G=HTS

or more completely as

G=U+PVTS

where

b)i) -RTln(K)=G

or -8.313*298.15 * ln(k) = 2.85

or k=1

Kp=Kc=1

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