Question

What are the units of k for the rate law: Rate = k[A]2[B]2, when the concentration...

What are the units of k for the rate law: Rate = k[A]2[B]2, when the concentration unit is mol/L?

A. s-1

B. L mol-1 s-1

C. L2 mol-2 s-1

D. L3 mol-3 s-1

A reaction has the following stoichiometry:

H2 + 2 ICl ---> I2 + 2 HCl

Which of the following would be a correct definition of the rate?

A. Rate = +Δ[H2]/Δt
B. Rate = +Δ[HCl]/Δt
C. Rate = -Δ[ICl]/Δt
D. Rate = +(1/2)Δ[HCl]/Δt

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Homework Answers

Answer #1

1.

units of rate = molL-1s-1

Units of concentration = molL-1

Hence for a general nth order reaction units of K = Units of rate / [units of concentration]n

n = order of the reaction

Hence Units of K = molL-1s-1 /[molL-1]n

Rate = K [A]2[B]2

overall order of the reaction = 2 + 2 = 4

Hence Units of K = molL-1s-1 /[molL-1]4 = L3 mol-3 s-1

Hence option (D) is correct annswer.

2.

Rate of a general reaction xA -------> yB is given as:

Rate of reaction = - 1/x[Rate of change of concentration of A] = + 1/y[rate of change of concentration of B]

- sign indicates concentration of reactants decreaseand

+ sign indicates the concentration of products increases

Hence potion (D) +(1/2)Δ[HCl]/Δ is the correct answer.

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