A student was asked to determine the enthalpy of the solution of KClO3 in water using Styrofoam calorimetry. Calibration was performed by mixing 8.00 mL 0.050 M HCl with 2.00 mL 0.200 M NaOH. The neutralization reaction (ΔH = -55.85 kJ/mol) was accompanied by a temperature change from 25.0 to 28.3°C. Using the same calorimeter, 0.300 g KClO3 (MW: 122.55) was dissolved in water and the temperature was observed to change from 23.6 to 17.3°C. (Assume that the total volume of the mixture in calibration is the same in the enthalpy measurement) What is the calorimeter constant in kJ/oC? What is the enthalpy of dissolution of KClO3 in kJ/mol? Is the dissolution endothermic or exothermic? Explain.
A student was asked to determine the enthalpy of the solution of KClO3 in water using Styrofoam calorimetry. Calibration was performed by mixing 8.00 mL 0.050 M HCl with 2.00 mL 0.200 M NaOH. The neutralization reaction (ΔH = -55.85 kJ/mol) was accompanied by a temperature change from 25.0 to 28.3°C. Using the same calorimeter, 0.300 g KClO3 (MW: 122.55) was dissolved in water and the temperature was observed to change from 23.6 to 17.3°C. (Assume that the total volume of the mixture in calibration is the same in the enthalpy measurement) What is the calorimeter constant in kJ/oC? What is the enthalpy of dissolution of KClO3 in kJ/mol? Is the dissolution endothermic or exothermic? Explain.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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A student was asked to determine the enthalpy of the solution of KClO3 in water using Styrofoam calorimetry. Calibration was performed by mixing 8.00 mL 0.050 M HCl with 2.00 mL 0.200 M NaOH. The neutralization reaction (ΔH = -55.85 kJ/mol) was accompanied by a temperature change from 25.0 to 28.3°C. Using the same calorimeter, 0.300 g KClO3 (MW: 122.55) was dissolved in water and the temperature was observed to change from 23.6 to 17.3°C. (Assume that the total volume of the mixture in calibration is the same in the enthalpy measurement)
- What is the calorimeter constant in kJ/oC?
- What is the enthalpy of dissolution of KClO3 in kJ/mol?
- Is the dissolution endothermic or exothermic? Explain.
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