# Exp2_Avogadro_report - moles of stearic acid in the...

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Experiment 2-Avogadro’s Number Report Sheet Name________________________________ GSI:____________________ Lab Partners__________________________ _____________________________________ Data for the Determination of Avogadro’s Number Trial 1 Trial 2 Trial 3 number of drops per mL of solution average number of drops per mL of solution density of stearic acid in solution (g/L) 0.12 number of drops per monolayer average number of drops per monolayer grams of stearic acid in monolayer (grams) density of pure stearic acid (g/cm 3 ) 0.941 volume of stearic acid in monolayer (cm 3 ) diameter of watch glass (cm) radius of watch glass (cm) surface area of watch glass (cm 2 ) molecular weight of stearic acid (g/mol) Calculation of Avogadro’s number: Using estimated dimensions of molecule estimated width of one stearic acid molecule (cm) surface area of one molecule (small end) (cm 2 ) number of molecules in the monolayer

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Unformatted text preview: moles of stearic acid in the monolayer calculate a value of Avogadro's number percent error Calculations 1. Calculate the number of drops per mL for each trial and the average number of drops per mL. 2. Calculate the surface area (A) of the monolayer in the watch glass in cm 2 . 3. Calculate the number of moles of stearic acid in the monolayer (the molecular weight of stearic acid is 284.5 g/mol). 4. Calculate the volume of stearic acid in the monolayer (state any assumptions you make in doing this calculation) (the density of pure stearic acid is 0.941 g/cm 3 ). 5. Using Figure 1 as a guide, estimate a realistic value of the width of the end of a stearic acid molecule. Use this value to calculate Avogadro's number. Calculate the percent error between your experimental value of Avogadro’s number and the accepted value in your textbook. Why do you think your number is different?...
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## This note was uploaded on 09/12/2009 for the course CHEM 1A taught by Professor Nitsche during the Spring '08 term at Berkeley.

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Exp2_Avogadro_report - moles of stearic acid in the...

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