Two solutions, initially at 24.69°C, are mixed in a coffee cup calorimeter (Ccal = 105.5 J/°C). When a 200.0 mL volume of 0.100 M AgNO3 solution is mixed with a 100.0 mL sample of 0.100 M NaCl solution, the temperature in the calorimeter rises to 25.16°C. Determine the DH°rxn, in units of kJ/mol AgCl. Assume that the density and heat capacity of the solutions is the same as that of water.
a. -78 kJ/mol AgCl
b. -25 kJ/mol AgCl
c. -64 kJ/mol AgCl
d. -32 kJ/mol AgCl
e. -59 kJ/mol AgCl

Question

Two solutions, initially at 24.69°C, are mixed in a coffee cup calorimeter (Ccal = 105.5 J/°C). When a 200.0 mL volume of 0.100 M AgNO3 solution is mixed with a 100.0 mL sample of 0.100 M NaCl solution, the temperature in the calorimeter rises to 25.16°C. Determine the DH°rxn, in units of kJ/mol AgCl. Assume that the density and heat capacity of the solutions is the same as that of water.
a. -78 kJ/mol AgCl  
b.  -25 kJ/mol AgCl  
c.  -64 kJ/mol AgCl  
d. -32 kJ/mol AgCl  
e. -59 kJ/mol AgCl