Chapter 17, Problem 17.117SP

Interpretation Introduction

Interpretation:

The equilibrium partial pressure of iodine vapour above solid iodine should be calculated at 25⁰C.

Concept Introduction:

The partial pressure is the pressure exerted by each gas in a gaseous mixture. The sum of all the partial pressures of each gas at a constant temperature will give the total pressure.
When, partial pressures are considered at equilibrium conditions then equilibrium constant K_p is the relationship between the reactant partial pressure and product partial pressure.
The standard free energy change is obtained as the difference of free energy of formation of products and reactants as follows:
$\Delta G^0=\Delta G_{f(prod)}^0-\Delta G_{f(reac)}^0$