Two solutions,initially at 24.60°C,are mixed in a coffee cup calorimeter (C_cal = 15.5 J/°C).When a 100.0 mL volume of 0.100 M AgNO₃ solution is mixed with a 100.0 mL sample of 0.200 M NaCl solution,the temperature in the calorimeter rises to 25.30°C.Determine the DH°_rxn for the reaction as written below.Assume that the density and heat capacity of the solutions is the same as that of water. NaCl(aq)+ AgNO₃(aq)→ AgCl(s)+ NaNO₃(aq)DH°_rxn = ?

Question

Quizplus · Accepted Answer

The heat absorbed by the calorimeter and the solutions can be calculated using q = mcΔT + C_calΔT. The total mass of the solution is 200 g (assuming density of water is 1 g/mL), and the specific heat capacity is 4.18 J/g°C. The temperature change ΔT is 0.70°C. Calculate q and then use the stoichiometry of the reaction to find ΔH°_rxn per mole of reaction.

Two Solutions,initially at 24