Lab #2 - Ideal Gas Law

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University of Illinois, Urbana Champaign *

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211

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Chemistry

Date

Feb 20, 2024

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docx

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2

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Saturday, February 10, 2024 Lab #2 – Ideal Gas Law You will use this worksheet as you work your way through the lab activity and submit it on CANVAS will all fields completed. Learning Outcomes: Calculate values using the Ideal Gas Law Validate the value of the Universal Gas Constant from experimental data. Perform error analysis of experimentally collected data. Supplies: Access to the PhysicsLE Lab Simulation Software – Ideal Gas Law Simulation Ideal Gas Law Excel Worksheet Background: The simulation demonstrates the relationship between pressure, temperature, and volume for a given number of moles of a gaseous substance. Calculations using the Ideal Gas Law: Ideal Gas Law: PV = nRT P = pressure in atm V = volume in cubic meters n = number of mols R = universal gas constant T = temperature in Kelvin Percent Error: [Absolute Value of (known value – experimental value) / (known value)] * 100% Procedure: 1. Start the Ideal Gas Law simulation. 2. Open Lab #2 – Ideal Gas Law Excel worksheet and prepare to record your data. 3. Conduct Run 1 a. Set volume at 0.200 m 3 b. Set temperature at 0.00ºC c. Change the moles of gas by 0.050-mole increments from 0.5 to 1.50 moles and record the pressure in Column B of the table. 4. Conduct Run 2 a. Set volume at 0.200 m 3 b. Set moles of gas at 1.0 moles c. Change the temperature by 5-degree increments from 0.0 to 150º C and record the pressure in Column E of the table. 5. Conduct Run 3 a. Place the temperature at 35°C b. Place moles of gas at 1.0 moles
Saturday, February 10, 2024 c. Change the volume by 0.02 m 3 increments from 0.20 to 0.80 m3 and record the pressure in Column H of the table. 6. Using PV=nRT calculate R for each data point placed in: a. Column J for the data in Columns A and B b. Column K for the data in Columns D and E c. Column L for the data n Columns G and H 7. Place the value for the ideal gas constant R to 4 decimal places in column N 8. Calculate the percent error for your calculations: a. Calculate the % error between columns N and J and place it in column P b. Calculate the % error between columns N and K and place it in column Q c. Calculate the % error between columns N and L and place it in column R 9. Format cell in Columns J, K, L, N, P, Q, and R to 4 decimal places 10. Calculate the average % error for each run and place it in the appropriate cell in column U. Post Lab Questions: 1. Which run had the greatest percent error? Click or tap here to enter text. 2. Why is there an error between the calculated values of R and the nominal value of R? Click or tap here to enter text. 3. What is your greatest average error? If it is greater than 2%, what has caused this error? Go back and correct the cause of the error so that your average error is reduced below 2%. Click or tap here to enter text.
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