Answered: solid dissolves in water, heat may be…

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

When solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter.

In the laboratory, a general chemistry student finds that when 1.46 g of CaCl₂(s) are dissolved in 107.70 g of water, the temperature of the solution increases from 25.53 to 27.94 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.59 J/°C.

Based on the student's observation, calculate the enthalpy of dissolution of CaCl₂(s) in kJ/mol.

Assume the specific heat of the solution is equal to the specific heat of the water.

ΔH_dissolution = ________ kJ/mol

When a solid dissolves in water, heat may be evolved or
absorbed. The heat of dissolution (dissolving) can be
determined using a coffee cup calorimeter.
Thermometer
In the laboratory a general chemistry student finds that when
1.46 g of CaCl,(s) are dissolved in 107.70 g of water, the
Cardboard or
Styrofoam lid
temperature of the solution increases from 25.53 to 27.94
°C.
The heat capacity of the calorimeter (sometimes referred to
as the calorimeter constant) was determined in a separate
experiment to be l1.59 J/°C.
Nested
Styrofoam cups
Based on the student's observation, calculate the enthalpy of
dissolution of CaCl2(s) in kJ/mol.
Reaction
occurs in
solution.
Assume the specific heat of the solution is equal to the
specific heat of water.
e t Cangage Lamng
AHdissolution
kJ/mol

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