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Lab__4_Report

# Lab__4_Report - Chromatography Lab Lab Section 2122...

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Chromatography Lab October 11, 2007 Lab Section 2122 Chemistry 1 1001 TA: Yanyan Huang Written by: Daniel Zachacki Purpose

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The purpose of this lab is to calculate the number of objects, seen and unseen, in a mole of a substance. We will attempt to duplicate Avogadro’s number, 6.03x10 23 , using experimental diameters and derived calculations of two different objects. Data/Results Part A. Table 1 Name of Object Molar Mass(g/mol) Density(g/mL) Glass Beads 5.02E+22 2.47 Note: Values provided by TA. Part A. Table 2 Diameter of Dish(cm) Avg Diameter of Dish(cm) Mass of Dish(g) Avg Mass of Dish(g) Mass of Dish+Beads(g) Avg Mass of Dish+Beads(g) 8.85 8.80 8.242 8.246 39.652 39.614 8.80 8.259 39.750 8.75 8.238 39.440 Note: Only calculated values of averages are used in calculations. Part B. Table 1 Name of Acid Molar Mass (g/mol) Pure Density(g/mL) Actual Density(g/mL) (v/v)% concentration #3 Paltimic Acid 256.4 0.8520 0.8080 0.0387% Note: values provided by TA. Part B. Table 2 Mass (g) Mass of Aditional 30 Drops(g) M water 126.187 M water+oil1 126.416 0.229 M water+oil2 126.632 0.216 M water+oil3 126.907 0.275 Note: The value of M water+oil3 is ignored because there is a larger the 10% difference between it and the other two values. So to obtain M 30drops We find the average of the two remaining values. Part B. Table 3
Calculated Avg Diameter of circle(cm) trial 1 33.25 trial 2 28.25 trial 3 31.75 avg of trials 31.08 Note: Diameter of circle is represented in calculations as D film After Lab Data Calculated N of Beads Trial # Calculated N of Film Average N %Error Standard Dev 4.18E+24 1 3.07E+23 1.209E+2 4 100.789 9.68E+22 2 1.15E+23 3 2.33E+23 Graph 1 Part B. Graph of calculated values of N for part B. shows a relative similarity between all three. The closeness of

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