The peroxydisulfate ion (s,o, ) reacts with the iodide ion in aqueous solution s

Question

The peroxydisulfate ion (s,o, ) reacts with the iodide ion in aqueous solution so,2-(aq) + 31- 2SO.(aq) + 1)-(aq) via the reaction An aqueous solution containing 0.050 M of s,O, ion and 0.072 M of I is prepared, and the progress of the reaction followed by measuring [ . The data obtained is given in the below. table (s) 0.000-4000 000 T2000-T6000 1-10 0.072 0057 0046 0037 0029- 1) What is the average rate of disappearance of I- between 400.0 s and 800.0 s in M/s. (5 points) 2) At elevated temperatures, dinitrogen pentoxide decomposes to nitrogen dioxide and oxygen: 2 N3O5(g) 4 NO2(g) + O2(g) When the rate of formation of NO,is 5.5x 10 M/s, what is the rate of decomposition of N,O, in M/s. (5 points) The first-order decomposition of cyclopropane has a rate constant of 6.7 × 10-4 s-1. If the ial concentration of cyclopropane is 1.33 M, what is the concentration of cyclopropane after s? (5 points)

Explanation / Answer

Ans 1 :

The concentration of I- at 800 s is 0.046 M

The concentration of I- at 400 s is 0.057

So the average rate of disappearance of I- between 400 s and 800 s will be :

= (0.046 - 0.057) / (800 - 400 )

= -0.011 / 400

= -0.0000275 M/s

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