Problem: 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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FREE Expert Solution

(a) AgNO₃ (aq) + NaI (aq) → AgI (s) + NaNO₃ (aq)

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

 = 0.392 g AgI