Näme () Answer the following questions and show all your calculations (each 5pts

Question

Näme () Answer the following questions and show all your calculations (each 5pts) 1) The reaction that occurs in a Breathalyzer, a device used to determine the alcohol level in a person's bloodstream, is given below. If the rate of appearance of Cr2(S04)3 is 1.24 mol/min at a particular moment, what is the rate of disappearance of C2H60 at that moment? 2 K2Cr207t 8 H2S04 + 3 C2H60 2 Cr2(SO4)3 + 2 K2S04 + 1 i Ho A concentration-time study of the gas phase reaction 2 A3 3 A2 produced the data in the table below [A3] (M) 4.00 x 10-4 2.00 x 10-4 3.00 x 10-4 1.00x lo-4 4.50×10-4 5.00 x 105 Time (s) [A2] (M) 10 20 30 What is the average rate (Mis) of decomposition of As in the time interval 20-30 seconds? b) What is the average rate (M/s) of formation of A2 in the time interval 20-30 seconds? e for the reaction:

Explanation / Answer

1. From the given equation, 2 moles of Cr2(SO4)3 will be formed when 3 moles of C2H6O is consumed.

so, if the rate of appearance of Cr2(SO4)3 is 1.24 mol/min

then, rate of disappearance of C2H6O at that moment => 1.24 mol/min * 3/2 => 1.86 mol/min

2. In the time interval 20-30 s,

a. Average rate of decomposition of A3 => Change in concentration/time interval

=>( 5 x 10-5 - 1 x 10-4 ) M / 30-20 s

=> - 5 x 10-5 M / 10 s => - 5 x 10-6 M/s

Negative sign indicates that it is decomposing.

b. Now, using the stoichiometric equation, we can say

Rate of formation of A2 => rate of disappearance of A3 * 3/2

=> 5 x 10-6 * 3/2 => 7.5 x 10-6 M/s

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