Table 2.2: Kinetics data for determining the reaction order of iodate. Run [lo31

Question

Table 2.2: Kinetics data for determining the reaction order of iodate. Run [lo31 initial, M Dosfinal, M Run Time, s Plot Time, s 0.00800 M To T1 0.00700 M 0.00800 M To TitT2 2 0.00700 M 0.00600 M To T1+T2+T3 0.00500 M 0.00600 M To T1+T2+T3+Ts 4 0.00500 M 0.00400 M To T1+T2+T3+T4 +Ts 5 0.00400 M 0.00300 M 0.00300 M 0.00200 M Pre-lab Questions Lab 2 Chemical Kinetics e. What is the half-life of this reaction given an initial butadiene concentration of 0.01000 M? 2. The final concentrations of iodate for runs 1 through 6 are shown in Table 2.2. Show how the final concentration of run 4 was obtained by using the values in Table 2.4 and the balanced chemical uation for this reaction. You actually have to perform and ALL your if needed. reagent is used in this run, Hints: After calculating how much of the limiting determine how much of the excess reagent remains.

Explanation / Answer

Q1

e)

for half life, simply:

t = 0 , t1/2 = ?

C0 = 0.008

C1/2 = 0.008/2 = 0.004

so, in the table, this is achieved when

T4 appears

so

t1/2 = t0+t1+t2+t3+t4

Q2.

e

for half life given the Equation:

1/A = 1/A0 + kt

solving for a specific case in whcih we know A0 then:

A1/2 = 1/2*A0 so:

1/(1/2A0) = 1/(A0) + 0.0614*t

(1/(0.5) - 1)*1/A0 =0.0614*t

and A0 = 0.01

(1/(0.5) - 1)*1/0.01=0.0614*t

100 = 0.0614*t

t = 100/0.0614

t = 1628.664 seconds

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