chem1008assignment4(feb 24)

# chem1008assignment4(feb 24) - 4.444 200 0.180-1.715 5.556...

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CHEMISTRY 1008 Name: ___________________ Homework Assignment #4 Due: Thursday, Feb. 24 1. (2 pts) The rate constant for the decomposition of N 2 O 5 shown here: N 2 O 5 (g) 2NO 2 (g) + ½ O 2 (g) is 4.9x10 -3 s -1 at 65 ° C and 5.0x10 -4 s -1 at 45 ° C. Determine the activation energy (E a ) of this reaction. 2. (8 pts) Table 1 below shows the concentration of N 2 O 5 (g) verses time for the following reaction: N 2 O 5 (g) NO 3 (g) + NO 2 (g) Table 2 shows useful values, which were calculated using the data in table 1. Finally the data in table 2 were used to make the three graphs shown on the next page. Table 1 : Raw Data Time (s) [N 2 O 5 ] (M) 0 0.950 50 0.459 100 0.302 150 0.225 200 0.180 250 0.149 300 0.128 350 0.112 400 0.0994 450 0.0894 500 0.0812 Table 2 : Calculated Values Using Raw Data Time (s) [N 2 O 5 ] t (M) ln[N 2 O 5 ] t 1/[ N 2 O 5 ] t 0 0.950 -0.0513 1.053 50 0.459 -0.779 2.179 100 0.302 -1.197 3.311 150 0.225 -1.492

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Unformatted text preview: 4.444 200 0.180-1.715 5.556 250 0.149-1.904 6.711 300 0.128-2.056 7.813 350 0.112-2.189 8.929 400 0.0994-2.309 10.060 450 0.0894-2.415 11.186 500 0.0812-2.511 12.315 Problem 2 Continued… [N2O5]t vs time 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 200 400 600 time (seconds) ln[N2O5]t vs time-3.0000-2.5000-2.0000-1.5000-1.0000-0.5000 0.0000 200 400 600 time (seconds) 1/[N2O5]t vs time 0.000 2.000 4.000 6.000 8.000 10.000 12.000 14.000 200 400 600 time (seconds) (a) Determine the order of the reaction. (b) Determine the value of the rate constant (k). (c) At what time would the concentration of N 2 O 5 be 10.0% of its starting concentration? (d) Predict the concentration of N 2 O 5 (g) at time = 25.00 seconds....
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