Two Solutions, Initially at 24

question 85

Multiple Choice

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 H°, in units of kJ . 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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Definitions:

Orthopnea

Shortness of breath that occurs when lying flat, forcing the person to sleep propped up in bed or sitting in a chair.

Exacerbation

A worsening or increase in the severity of symptoms or disease.

Bronchovesicular Breath Sounds

Normal breath sounds heard over the main bronchus area and over the upper right posterior lung field, characterized by moderate pitch and intensity.

Pathologic Disease

A disease characterized by an identifiable set of signs or symptoms, often associated with disordered bodily function.