# Problem: Consider the sublimation of iodine at 25.0 ˚C: I2(s) → I2(g)Find ΔG˚rxn at 25.0 ˚C under the following nonstandard conditions:(ii) PI2 = 0.155 mmHg

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###### FREE Expert Solution

Reaction:  I2(s) → I2(g)

ΔG°rxn  19.30 kJ/mol

Recall that ΔGrxn and Q are related to each other:

$\overline{){{\mathbf{\Delta G}}}_{{\mathbf{rxn}}}{\mathbf{=}}{\mathbf{\Delta G}}{{\mathbf{°}}}_{{\mathbf{rxn}}}{\mathbf{+}}{\mathbf{RTlnQ}}}$

Reaction Quotient, Q

$\overline{){\mathbf{Q}}{\mathbf{=}}\frac{{\mathbf{P}}_{\mathbf{products}}}{\overline{){\mathbf{P}}_{\mathbf{reactants}}}}{\mathbf{=}}{{\mathbf{P}}}_{{\mathbf{I}}_{\mathbf{2}}}}$

**Solids and liquids are ignored in equilibrium expression

###### Problem Details

Consider the sublimation of iodine at 25.0 ˚C: I2(s) → I2(g)

Find ΔG˚rxn at 25.0 ˚C under the following nonstandard conditions:
(ii) PI2 = 0.155 mmHg