Densities of - The average of the densities of each unknown was calculated x solid =(7.20g/mL 7.84g/mL 8.07g/mL 3 = 7.70 g/mL x liquid =(0.878g/mL

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Densities of Liquids and Solids By Julian Remouns Lab Instructor: Pasquale Iacono September 5, 2007
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Results and Discussion: The densities of an unknown solid and an unknown liquid were determined by finding the mass and volume of the unknown. Three experimental trials were performed for each unknown. The data and calculated results were tabulated (Tables 1 and 2). Table 1: Unknown Solid Data and Results Trial # Mass of solid (g) Volume of solid (mL) Calculated density of solid (g/mL) 1 9.864 1.37 7.20 2 9.878 1.26 7.84 3 9.848 1.22 8.07 Table 2: Unknown Liquid Data and Results Trial # Mass of liquid (g) Volume of liquid (mL) Calculated density of liquid (g/mL) 1 3.668 4.18 0.878 2 6.538 7.05 0.927 3 7.784 8.62 0.903 The densities were calculated using the density equation, d = m/v, where d is the density, m is the mass and v is the volume of the unknown. An example of the calculations using the data from trial # 1 in table 1 follows: d = 9.864g/ 1.37 mL = 7.20 g/mL
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Unformatted text preview: The average of the densities of each unknown was calculated, x solid = (7.20g/mL + 7.84g/mL + 8.07g/mL)/ 3 = 7.70 g/mL x liquid = (0.878g/mL + 0.927g/mL + 0.903g/mL)/ 3 = 0.903 g/mL and compared to a table of known densities for solids and liquids. Given the relatively small average deviation, ∆ X solid = |1.01| / 3 = 0.337 g/mL ∆ X liquid = |0.049| / 3 = 0.046 g/mL relative average deviation, solid: 0.337g/mL / 7.70 g/mL *100 = 4.38 liquid: 0.046g/mL / 0.903g/mL *100 = 1.80 and percent error, solid: | (7.8 g/mL – 7.7 g/mL) / 7.8g/mL| *100 = 1.28 liquid: |(0.9003 g/mL – 0.903 g/mL) / 0.9003 g/mL| *100 = 0.3 of the calculated densities, the results were determined to contain an adequate degree of precision and accuracy. Conclusion: The unknown solid was determined to be steel. The unknown liquid was determined to be Ethyl acetate....
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This note was uploaded on 05/25/2008 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Densities of - The average of the densities of each unknown was calculated x solid =(7.20g/mL 7.84g/mL 8.07g/mL 3 = 7.70 g/mL x liquid =(0.878g/mL

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