Insoluble AgCl(s) precipitates when solutions of AgNO₃(aq) and NaCl(aq) are mixed.

To measure the energy evolved in this reaction, 250. mL of 0.16 M AgNO₃(aq) and 125 mL of 0.32 M NaCl(aq) are mixed in a coffee-cup calorimeter. The temperature of the mixture rises from 21.15°C to 22.90°C. Calculate the enthalpy change for the precipitation of AgCl(s), in kJ/mol. (Assume the density of the solution is 1.0 g/mL and its specific heat capacity is 4.2 J/g ∙ K.)

Transcribed Image Text:

AgNO3(aq) + NaCl(aq) AgCl(s) + NaNO3(aq) A,H° = ?