Two Solutions,initially at 24

question 110

Multiple Choice

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 = ?

• A) -35 kJ
• B) -69 kJ
• C) -250 kJ
• D) -16 kJ
• E) -140 kJ

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