The standard free energy of formation of AgI(s)is -66.2 kJ/mol.Δ_rG° for the reaction 2AgI(s)→ 2Ag(s)+ I₂(s)is: A) 132.4 kJ B) 66.2 kJ C) -132.4 kJ D) -66.2 kJ E) 800 KJ

Question

Quizplus · Accepted Answer

The standard free energy change for the reaction is twice the negative of the standard free energy of formation of AgI(s), which is 2 x (-66.2 kJ/mol) = -132.4 kJ/mol. However, since the reaction is the reverse of formation, it becomes positive, so Δ_rG° = 132.4 kJ.

The Standard Free Energy of Formation of AgI(s)is -66