4. Pure ozone decomposes slowly to oxygen, 2 O,(g)-) 3 02(g). Use the data provi

Question

4. Pure ozone decomposes slowly to oxygen, 2 O,(g)-) 3 02(g). Use the data provided in a graphical method and determine the order and rate constant of the reaction. Time (b) TOIM 1.00x10 4.98x 10 2000 7600 2.07x10 10000 12300 | 1.39×106 14300 1.22x10 17000 1.05x10 1.66x10 Must draw the graph that indicates the order and give the fitted equation Write the complete integrated rate law equation. 5. The isomerization reaction, CH3NC CH3CN, is first order and the rate constant is equal to 0.46s at 600 K. What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.10 M? 6. What is the half-life for the decomposition of NOCl when the initial concentration of NOCI is 0.15 M? The rate constant for this second-order reaction is 8.0x10 M s

Explanation / Answer

Question 5

ln A = -kt + ln Ao

k = rate constant                   t = time

Ao = Initial concentration                A = concentration at time t

Using the above formula we can calculate the concentration

t = 0.2 Min = 12 seconds

ln A = - 0.46 x 12 + ln 0.1

ln A = -7.8225

A = 4.011 x 10-4 M

Hence after 0.2 Minutes the concentration of the CH3NC is 4.011 x10-4 M

Question 6

For a second order reaction

t½ = 1 / k [Ao]

t½ = 1 / (8 x 10-6) x 0.15 =  833333.3 Seconds or 231.4814 Hour

Half life of the reaction is 231.4814 hour

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