supl001probs - SUPL001Problems 1. A student reports the...

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SUPL 001 – Problems 1. A student reports the following data in several determinations of the density of a homogeneous solid plastic sphere. RUN 1 RUN 2 RUN 3 RUN 4 Mass of Sphere (g) 8.30 8.34 8.25 8.32 Volume of Sphere (mL) 6.3 6.4 6.3 6.6 [Should we view this as 4 independent determinations of density or as 4 determinations of mass and 4 independent determinations of volume? Since the experimental determinations of mass and volume are independent experimental processes, the latter seems the appropriate way to view the data. So, we can calculate the averages of the measurements of mass and volume and compute the density from those quantities.] a. How should the student report the mass of the sphere? What is the percent deviation? M avg = (8.30 + 8.34 + 8.25 + 8.32) / 4 = 8.30 g Avg dev = (0.00 + 0.04 + 0.05 + 0.02) / 4 = .03 g The mass of the sphere is: 8.30 ± 0.03 g Pct dev = 100 X 0.03 / 8.30 = 0.4 % b. How should the student report the volume of the sphere? What is the percent deviation? V avg = (6.3 + 6.4 + 6.3 + 6.6) / 4 = 6.4 mL Avg dev = (0.1 + 0.0 + 0.1 + 0.2) = 0.1 mL The volume of the sphere is: 6.4 ± 0.1 mL Pct dev = 100 X 0.1 / 6.4 = 2 % c. How should the student report the density of the sphere? What is the percent deviation? d
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This note was uploaded on 11/28/2011 for the course CHE 143 taught by Professor Raleigh during the Spring '09 term at SUNY Stony Brook.

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supl001probs - SUPL001Problems 1. A student reports the...

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