Two Solutions,initially at 24 $D _ { \mathrm { r } }$

Two solutions,initially at 24.69 °C,are mixed in a coffee cup calorimeter (C_cal = 105.5 J °C^-1) .When a 200.0 mL volume of 0.100 mol L^-1 AgNO₃ solution is mixed with a 100.0 mL sample of 0.100 mol L^-1 NaCl solution,the temperature in the calorimeter rises to 25.16 °C.Determine the $D _ { \mathrm { r } }$ H°,in units of kJ $\mathrm { mol } ^ { - 1 }$ .Assume that the density and heat capacity of the solutions is the same as that of water. Hint: Write a balanced reaction for the process.

A) -32 kJ mol^-1
B) -78 kJ mol^-1
C) -64 kJ mol^-1
D) -25 kJ mol^-1
E) -52 kJ mol^-1

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