(a) AgNO_{3} (aq) + NaI (aq) → AgI (s) + NaNO_{3} (aq)

**$\mathbf{50}\mathbf{.}\mathbf{0}\mathbf{}\overline{)\mathbf{mL}}\mathbf{}\mathbf{\times}\frac{{\mathbf{10}}^{\mathbf{-}\mathbf{3}}\mathbf{}\overline{)\mathbf{L}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mL}}}\mathbf{\times}\frac{\mathbf{5}\mathbf{.}\mathbf{0}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{NaI}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{L}}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{NaI}}}{\mathbf{149}\mathbf{.}\mathbf{89}\mathbf{}\overline{)\mathbf{g}\mathbf{}\mathbf{NaI}}}\mathbf{\times}\frac{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{AgI}}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{NaI}}}\mathbf{\times}\frac{\mathbf{234}\mathbf{.}\mathbf{77}\mathbf{}\mathbf{g}\mathbf{}\mathbf{AgI}}{\mathbf{1}\mathbf{}\overline{)\mathbf{mol}\mathbf{}\mathbf{AgI}}}$**

** = 0.392 g AgI**

Silver bromide is used to coat ordinary black-and-white photographic film, while high-speed film uses silver iodide.

*(a) When 50.0 mL of 5.0 g/L AgNO3 is added to a coffee-cup calorimeter containing 50.0 mL of 5.0 g/L NaI, with both solutions at 25°C, what mass of AgI forms?*

(b) Use Appendix B to find ΔH°rxn.

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