Calculating Enthalpy of Solution from Calorimetry Data
Published:
Experiment 8 - Data and Report
Calculate the molar enthalpy of solution ($\Delta H_{sol}$) in kJ/mol for each trial based on the provided experimental data.
| Measured Value | Unknown C Trial 1 | Unknown C Trial 2 | Unknown B Trial 1 | Unknown B Trial 2 |
| :--- | :---: | :---: | :---: | :---: |
| Mass of unknown (g) | 5.001 | 5.001 | 5.167 | 5.000 |
| Initial Temperature ($^\circ C$) | 21.0 | 20.5 | 21.0 | 21.0 |
| Final Temperature ($^\circ C$) | 24.5 | 26.8 | 17.5 | 19.5 |
| Temperature Change ($^\circ C$) | 3.5 | 6.3 | -3.5 | -1.5 |
| $\Delta H_{sol}$ (kJ/mol) | | | | |
This question includes visual content: A table titled 'Experiment 8 - Data and Report' showing calorimetry results. The rows are: Mass of unknown (g), Initial Temperature (°C), Final Temperature (°C), Temperature Change (°C), and $\Delta H_{sol}$ (kJ/mol). There are four columns of data: 'Unknown C Trial 1', 'Unknown C Trial 2', 'Unknown B Trial 1', and 'Unknown B Trial 2'. Specific data points include: Unknown C T1 (mass 5.001g, $\Delta T$ 3.5), Unknown C T2 (mass 5.001g, $\Delta T$ 6.3), Unknown B T1 (mass 5.167g, $\Delta T$ -3.5), and Unknown B T2 (mass 5.000g, $\Delta T$ -1.5).
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Step by Step Written Solution
In this problem, we're looking at experimental data from a calorimetry lab to find the enthalpy of solution for two unknowns across four trials. However, the molar mass is not provided in the table, so we will focus on calculating the heat of the solution in kilojoules for Unknown C, Trial one.
Calorimetry Data Analysis
Let's list our known values for Unknown C, Trial one from the first column of the table.
Given for Unknown C Trial 1:
First, we check the temperature change, delta T. It is the final temperature minus the initial temperature.
Substituting our values, twenty-four point five minus twenty-one point zero gives us a change of three point five degrees Celsius. Since the temperature increased, the process is exothermic.
To calculate the heat, q, we use the calorimetry formula: mass times specific heat capacity times the change in temperature.
Heat Calculation
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