4.3 Lab 4 Gaseous Diffusion, Graham’s Law EXTRA CREDIT Jennie Chang (odd) Allison Yee (Partner) Sharon Oh (Partner)
CALCULATIONS: 1. Determine experimental distance ratio Find average of distances for each gas Sample from data: (11.0 cm + 10.3cm) / 2 = 10.7 D A = M B Sample from data: D A = 15.0cm = 1.40 : 1 D B = M A D B = 10.7cm 2. Determine the theoretical distance ratio by using Graham’s Law Rate A = = 36.5g = 1.47 : 1 Rate B = Mass A 17.0g 3. Determine the experimental error (% error) Equation: E – T x 100% T 1.40 – 1.47 x 100% = |-4.76%| = 4.76% 1.47 TABLE OF RESULTS: Average distance NH 3 15.0 cm Average distance HCl 10.7 cm Experimental distance ratio 1:40 : 1 Theoretical distance ratio 1.47 : 1 Percent error 4.76% DISCUSSION: This lab was quite confusing at first, but once we got the hang of it, everything went smoothly. First, we started off the lab wrong. 1) A source of error was we did not read over all the instructions before starting. We did not put in the HCl and the NH 3 in at the same time. Suggested improvement: Read the instructions very carefully before starting. 2) Another source of error was that we accidentally threw away the cotton ball
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