Consider this initialrate data at a certain temperature for

Consider this initial-rate data at a certain temperature for the reaction described by

O 2/27/2018 02:20 PM A 13/15 O Calculator Periodic Table O Gradebook Question 7 of 8 Map A General Chemistry 4th Edition McQuarrie • Rock · Gallogly University Science Books presented by Sapling Learning Consider this initial-rate data at a certain temperature for the reaction described by Initial rate (M/S) C,H,Ci(g) C,H, (g) + HCl(g) [C2H5Cl]0 (M) | 0.100 0.200 0.300 0.595x 10-30 1.19x 10-30 1.79x 10-30 Determine the value and units of the rate constant. Number Units k= Select answer O Previous Q Check Answer O Next Exit ? Hint

Solution

Let us say rate expression is

rate = k [reactant]^a

Now comparing rtrail 1 and 2

rate 2 / rate 1 = 0.2/0.1 = [1.19 /0.595 ]^a Thus 2 = 2^a

Hence a = 1

similarly comparing rate 3 with rate 1

0.3/0.1 = [1.79/0.595]^a or 3 = 3^a

Thus a = 1

That is the rate expression is

rate = k [C2H5Cl]

To calculate k value let us substitute trial 1 in the rate expression.

0.100 M = k [ 0.595x10³⁰ M/s]

Thus k = 1.680x10^-31sec