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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).
- Spring '07