Two Solutions,initially at 24

question 120

Multiple Choice

Two solutions,initially at 24.60 °C,are mixed in a coffee cup calorimeter (C_cal = 15.5 J °C^-1) .When a 100.0 mL volume of 0.100 mol L^-1 AgNO₃ solution is mixed with a 100.0 mL sample of 0.200 mol L^-1 NaCl solution,the temperature in the calorimeter rises to 25.30 °C.Determine the D_rH° for the reaction as written below.Assume that the density and specific heat capacity of the solutions is the same as that of water. NaCl(aq) + AgNO₃(aq) → AgCl(s) + NaNO₃(aq) D_rH° = ?

• A)-35 kJ mol^-1
• B)-59 kJ mol^-1
• C)-250 kJ mol^-1
• D)-16 kJ mol^-1
• E)-140 kJ mol^-1