Use the reaction I2(s) I2(g), H = 62.4 kJ/mol, S = 0.145 kJ/(molK) At what temperature is the reaction at equilibrium?
A.157K
B.430K
C.0.002K
D.62K

B. 430 K

Explanation:

According to Gibb's equation:

= Gibbs free energy  

= enthalpy change  = +62.4 kJ/mol

= entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

 = +ve, reaction is non spontaneous

 = -ve, reaction is spontaneous

 = 0, reaction is in equilibrium

for reaction to be spontaneous

Thus the Reaction is spontaneous when temperature is 430 K.

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