Chapter 18.6, Problem 4CP

The $K_{\text{sp}}$ for iron(III) hydroxide $\left[\text{Fe}{\left(\text{OH}\right)}_{\text{3}}\right]\text{ is 1}\text{.1 }\times {\text{ 10}}^{\text{-36}}\text{at 25°C}$. For the process:

$\text{Fe}{\left(\text{OH}\right)}_3\left(s\right)\rightleftarrows {\text{Fe}}^{\text{3+}}\left(aq\right)+3{\text{OH}}^{\text{-}}\left(aq\right)$

Determine $\Delta Gº\left(\text{in kJ/mol}\right)\text{ at 25ºC}\text{.}$

a)

$-2.73\times {10}^{-36}\text{kJ/mol}$

b)

$-17.2\text{ kJ/mol}$

c)

$17.2\text{ kJ/mol}$

d)

$\text{-205 kJ/mol}$

e)

$\text{205 kJ/mol}$