Question

On the basis of the information below, the dissolution of FeF2(s) in acidic solution is A. thermodynamically favorable, because K2 > 1 B. thermodynamically favorable, because K3 > 1 C. not thermodynamically favorable, because K1<1 D. not thermodynamically favorable, because K3 < 1 hint (Hess's law) FeF2(s) – Fe2+(aq) + 2 F"(aq) F"(aq) + H+ (aq) 2 HF(aq) FeF2(s) + 2 H+ (aq) 2 Fe2+ (aq) + 2 HF(aq) K1 = 2 x 10-6 K2 = 1 * 103 K3 = ?

Answer 1

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Data;

• FeF2 is in an acidic solution
• K2 > 1 is thermodynamically favorable
• k3 > 1 is not thermodynamically favorable
• K1<1 is not thermodynamically favorable

Hess Law

This states that the heat change in a given chemical reaction is the same irrespective of the number of process in which the reaction is effected.

Using Hess Law;

$rxn_3 = rxn_1 * 2rxn_2\\k_3 = k_1 * k_2^2\\k_3 = 2*10^-^6 * (1*10^3)^2\\k_3 = 2$

substituting this using Gibbs law,

$\delta G^0_3 = -RT\ln K_3\\\delta G^0_3 < 0$

Since K3 is greater than 1, the reaction is thermodynamically favorable.

Learn more on Hess law here;

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