GMontenaro M4 Lab 1 Estimating Avogadros Number

.docx

School

SUNY Empire State College *

*We aren’t endorsed by this school

Course

1205

Subject

Chemistry

Date

Apr 3, 2024

Type

docx

Pages

9

Uploaded by BailiffSnail3312 on coursehero.com

Estimating Avogadro’s Number Grace Montenaro 3/2/2024 Purpose This lab is designed to enable students to estimate the number of stearic acid molecules in a mole of the substance by measuring the volume of a known mass of stearic acid and calculating the area occupied by a single molecule using a monolayer film composed of stearic acid molecules. Additionally, it aims to estimate Avogadro’s number by determining the count of aluminum atoms in a specified volume and mass of aluminum foil. Through practicing these calculations involving volume, mass, moles, and molecules, students will gain insights into determining other parameters such as density, concentration, molecular mass, and Avogadro’s number. Procedure This experiment starts with the gathering of the necessary materials which includes stearic acid in a hexane solution (6 mL), thread, a syringe, a ruler, pipette, weighing boats, an electronic balance, medium-sized glass dish, a toothpick, bottled water, and aluminum foil. To start this experiment the bowl will be filled with water to the brim so the surface tension can be visible. Taking the thread, and cutting a section 25 cm long, a loop will be created. The loop will then be placed on the surface of the water, ensuring that all points of the loop are touching the water and there are no gaps. This is to ensure that no Stearic acid leaks out. Using the syringe, the amount of static acid taken from the bottle will be measured. Then, one drop at a time, will be transferred to the area inside the loop. Once the thread takes on a circular appearance, with a noticeable shine, this is when the Stearic acid monolayer has been formed. Once the correct amount has been placed in the circle the remaining amount in the syringe will be measured to calculate the volume of the amount of liquid used. Then the diameter of the monolayer
1 will be measured. Repeat these steps for trial 2. Using the data collected and the data provided in the lab assignments the mass of stearic acid will be calculated, along with the moles of stearic acid, the area of stearic acid, the number of stearic acid molecules, and Avogadro’s number for each trial. The same calculations will be made for a piece of aluminum foil. This piece of foul will be cut and measured by the dimensions and mass of the piece. Once that is complete the same calculations will be made using the data gathered and the data provided. The number of layers in the aluminum atoms will also be calculated. Experimental Data Data Table 1 Include correct units for each data. Trial 1 Trial 2 Calculations (for Trial 1) Length of Thread Used 24cm 26cm Radius of Loop 3.82cm 4.14cm Area of Loop 45.82cm 2 53.82cm 2 Initial Volume of Stearic Acid Solution in Syringe 7.50 mL 6.50mL Final Volume of Stearic Acid Solution 5.65 mL 3.95 mL © 2016 Carolina Biological Supply Company
2 Trial 1 Trial 2 Calculations (for Trial 1) in Syringe Volume of Stearic Acid Dispensed 1.85 mL 2.55 mL Concentration of Stearic Acid in Hexane 0.0001g/ mL 0.0001g/ mL Mass of Stearic Acid 0.000185g 0.000255g Moles of Stearic Acid 6.5x10 -7 mols 9x10 -7 mols Area of Stearic Acid 45.82cm 2 53.82cm 2 Area of One Stearic Acid 20.7x10 -16 20.7x10 -16 Number of Stearic Acid Molecules 2.214x10 16 2.6x10 16 © 2016 Carolina Biological Supply Company
3 Trial 1 Trial 2 Calculations (for Trial 1) Avogadro’s Number 3.41x10 22 2.89x10 22 Average Avogadro’s Number 3.15x10 23 % Error on Avogadro’s Number 51.03% 1. © 2016 Carolina Biological Supply Company
Your preview ends here
Eager to read complete document? Join bartleby learn and gain access to the full version
  • Access to all documents
  • Unlimited textbook solutions
  • 24/7 expert homework help
Recommended textbooks for you
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry: An Atoms First Approach
Chemistry
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Cengage Learning
Text book image
World of Chemistry, 3rd edition
Chemistry
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Brooks / Cole / Cengage Learning
Text book image
Chemistry: The Molecular Science
Chemistry
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:Cengage Learning
Text book image
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
SEE MORE TEXTBOOKS
Recommended textbooks for you
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781337399074
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry & Chemical Reactivity
Chemistry
ISBN:9781133949640
Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel
Publisher:Cengage Learning
Text book image
Chemistry: An Atoms First Approach
Chemistry
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Cengage Learning
Text book image
World of Chemistry, 3rd edition
Chemistry
ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Brooks / Cole / Cengage Learning
Text book image
Chemistry: The Molecular Science
Chemistry
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:Cengage Learning
Text book image
Chemistry: Principles and Practice
Chemistry
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Cengage Learning
SEE MORE TEXTBOOKS