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


50.0 mL ×10-3 L1 mL×5.0 g NaI1 L×1 mol NaI149.89 g NaI×1 mol AgI1 mol NaI×234.77 g AgI1 mol AgI

 = 0.392 g AgI


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Problem Details

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.