Two Solutions, Initially at 24

question 117

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 Δ_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) Δ_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

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Definitions:

Cross-Sectional Study

A research method that compares subjects of different ages or groups at a single point in time.

Different Ages

The varying stages of life through which an individual progresses, each characterized by distinct physical, psychological, and social changes.

Terminal Decline

The accelerated deterioration of cognitive and physical health that may occur in the final months before death.

Longitudinal Study

A research design that involves repeated observations of the same variables over short or long periods of time to detect changes or developments.