3-5: Heat of Combustion: Chicken FatThe heat of combustion (AHcomb) is the heat of reaction for the complete burning (reacting with O2) of onemole of a substance to form CO2 and H2O. Calorimetry experiments that measure the heat of combustioncan be performed at constant volume using a device called a bomb calorimeter. In a bomb calorimeter asample is burned in a constant-volume chamber in the presence of oxygen at high pressure. The heat thatis released warms the water surrounding the chamber. By measuring the temperature increase of thewater, it is possible to calculate the quantity of heat released during the combustion reaction. In thisassignment you will calculate the heat of combustion of chicken fat. The calorimeter has already beencalibrated by combusting benzoic acid.1. Start Virtual ChemLab, select Thermodynamics, and then select Heat of Combustion: Chicken Fatfrom the list of assignments. The lab will open in the Calorimetry laboratory with the bombcalorimeter out and disassembled and with a sample of chicken fat in the calorimeter cup on thebalance. The balance has already been tared.2. Record the mass of the chicken fat sample from the balance. If you cannot read it click on theBalance area to zoom in, record the mass in the data table below and return to the laboratory.3. Double-click the following (in numerical order) to assemble the calorimeter: (1) the cup on thebalance pan, (2) the bomb head, (3) the screw cap, and (4) the bomb. Click the calorimeter lid to closeit. Combustion experiments can take a considerable length of time. Click the clock on the wall labeledAccelerate to accelerate the laboratory time.4. Click the bomb control panel and the plot window to bring them to the front. Click on the Save buttonto save data to the lab book. Allow the graph to proceed for 20-30 seconds to establish a baselinetemperature.5. Click Ignite and observe the graph. When the temperature has leveled off (up to 5 minutes oflaboratory time), click Stop. A data link icon will appear in the lab book. Click the data link icon toview the collected data. Record the temperature before and after ignition of the chicken fat sample inthe data table.Data Tablechicken fatmass of sample (g)initial temperature (°C)final temperature (°C)28.766. Calculate AT for the water using AT = |T;– Ti|.7. Calculate the moles of chicken fat in the sample (MWfat = 797.7 g/mol). 8. AHcomb for chicken fat can be calculated using AHomh = (Cstem AT)/n, where n is the moles ofchicken fat in the sample and Csystem is the heat capacity of the calorimetric system.Use 10.310 kJ/K for Cystem and calculate the heat of combustion, in kJ/mol, for chicken fat.9. If the accepted value for the heat of combustion for chicken fat is 30,038 kJ/mol calculate the percenterror.lyour answer – accepted answer% Error =× 100accepted answer% Error =This experiment does not consider that all of the conditions are standard state conditions; therefore,you are calculating AHcomb not AH°comb.10. The "calorie" used to measure the caloric content of foods is actually a kilocalorie (kcal) or 4184 kJ.If the heat of combustion for sugar is 5639 kJ/mol, why are people who are on limited calorie dietsadvised to limit their fat intake?11. The food that we ingest is certainly not “combusted" in the same manner as is done in a bombcalorimeter.Why can we compare the heats of combustion of sugar or chicken fat measured in a bombcalorimeter with the caloric content of those foods?

As per the rules, only 3 sub parts can be answered: So only questions, 6, 7 and 8 are being…

8. AHcomb for chicken fat can be calculated using AHcomb = (Custem AT )/n, where n is the moles of chicken fat in the sample and Caystem is the heat capacity of the calorimetric system. Use 10.310 kJ/K for Cystem and calculate the heat of combustion, in kJ/mol, for chicken fat.

8. AHcomb for chicken fat can be calculated using AHcomb = (Custem AT )/n, where n is the moles of chicken fat in the sample and Caystem is the heat capacity of the calorimetric system. Use 10.310 kJ/K for Cystem and calculate the heat of combustion, in kJ/mol, for chicken fat.

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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