Rate Law Worksheet Answers PDF

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Rate Law Worksheet

1. The rate of formation of OI— in the chemical reaction OCl— + I— à OI— + Cl— is given by the rate law: '() — [,— ] !"#$ = & ['.— ] What is the overall reaction order and the order with respect to OH—? •

overall reaction order is 1

•

order with respect to OH— is —1

2. The rate law for the reaction A + 2B à C is second order in A and second order in B and has a rate constant of 1.25 × 10—2 s—1 at 30 ºC. Find the rate of reaction when the concentration of A is 0.27 Mand the concentration of B is 0.32 M. rate = k[A]6 [B]6 = 1.25×10=6(0.27)6 (0.32)6 = 9.3×10=C •

the rate of the reaction is 9.3×10=C M/s

3. For the general chemical reaction, A + B à products, the following data were obtained from three experimental trials: Exp.

Initial [A]o (mol/L)

Initial [B]o (mol/L)

Initial Rate of Formation of Products (M s—1)

1

0.040

0.040

9.6 × 10—6

2

0.080

0.040

1.92 × 10—5

3

0.080

0.020

9.6 × 10—6

a. Determine the rate law for this reaction. •

when concentration of A is doubled (exp. 1 to 2), the initial rate doubles o

•

order with respect to A is 1

when concentration of B is doubled (exp. 3 to 2), the initial rate doubles o

order with respect to B is 1

è rate = k A [B] b. Find the rate constant with units. •

using exp. 1 data and the rate law rate = k A B 9.6×10=E FMH =I rate = k= = 6.0×10=K FM=Is =I A [B] (0.040FM)(0.040FM)

c. What is the initial rate of reaction when [A]o = 0.12 M and [B]o = 0.015 M? rate = k A B = 6.0×10=K 0.12 0.015 = 1.1×10=CFMs =I

4. What is the rate equation for the reaction 2C + 2D à E + F, which proceeds by the mechanism given below? 2C ⇄ C2 (equilibrium) C2 +D ⇄ X + E (rate determining) X+D⇄F (rapid) • theFrateFequationFisFrate = k[C]6 [D] 5. For a reaction with the experimental rate law of rate = k[A]2: a. What happens to the rate if the concentration of A is doubled? •

the rate would quadruple

b. What happens to the rate if the concentration of A is reduced to one third the initial concentration? •

the rate would be reduced by two-thirds (2 3)...