A.The mechanism for the reaction H 2 ( g ) + 2 ICl(I) ® 2 HCl( g ) + I 2 ( g ) i

Question

A.The mechanism for the reaction H2(g) + 2 ICl(I) ® 2 HCl(g) + I2(g) is proposed to be:

Step 1: H2(g) + ICl(g) ® HI(g)+ HCl(g)

(slow)

Step 2: HI(g) + ICl(g) ® I2(g) +HCl(g)

(fast)

What is the molecularity of the rate-determining step?

a.

zeromolecular

b.

unimolecular

c.

bimolecular

d.

termolecular

e.

More information is needed to answer this question.

B.   Chromic acid is a diprotic acid:

H2CrO4(aq) D HCrO4-(aq) + H+(aq)    Ka1 = 3.55

HCrO4-(aq) D CrO42-(aq) + H+(aq)     Ka2 = 3.36 ´ 10-7

Calculate the theoretical value of the equilibrium constant for 2 HCrO4-(aq) D H2CrO4(aq) + CrO42-(aq).

a.

1.05 ´ 107

d.

8.38 ´ 105

b.

1.19 ´ 10-6

e.

0.282

c.

9.46 ´ 10-8

C.   The following reactions at 1000.0 K have the following Kp values:

H2(g) + Cl2(g) D 2 HCl(g)                   Kp = 3.8 ´ 104

H2(g) + Br2(g) D 2 HBr(g)                  Kp = 5.1 ´ 108

Br2(g) + Cl2(g) D 2 BrCl(g)                 Kp = 0.20

What is Kp for the reaction, HCl(g) + HBr(g) D BrCl(g) + H2(g), at 1000.0 K?

a.

5.1 ´ 10-7

d.

0.45

b.

1.0 ´ 10-7

e.

1.0 ´ 10-14

c.

5.2 ´ 10-15

D.Consider the equilibrium A + B D C. What is significant about the reaction quotient when [B] = [C]?

a.

only that [B] = [C]

b.

[A] = [B] = [C]

c.

[B] = [C] = K

d.

[A] = K

e.

The reaction must run in the forward direction.

E. What is the value of the equilibrium constant at 5.00 ´ 102 K for a chemical equilibrium that has a DH° value of 250 kJ/mol and a DS° value of 48 J/mol × K?

a.

4.2 ´ 1028

d.

2.5 ´ 10–24

b.

–3.0 ´ 104

e.

7.6

c.

–54

F.   The prediction of linearity in a van ’t Hoff plot assumes __________

a.

that the reaction is run under ideal conditions.

b.

that DH° and DS° are independent of temperature.

c.

that DG° is independent of temperature.

d.

that ln K is independent of temperature.

e.

none of the above.

Step 1: H2(g) + ICl(g) ® HI(g)+ HCl(g)

(slow)

Step 2: HI(g) + ICl(g) ® I2(g) +HCl(g)

(fast)

Explanation / Answer

A)

molecularity of the rate-determining step:Ter molecular as you see that the molecularity of a reaction simply counts the number of species (molecules, ions, atoms or free radicals) taking part in that step. In this reaction 3 Different species are involved , H2, ICl, HI

F) The prediction of linearity in a van ’t Hoff plot assumes that DH° and DS° are independent of temperature.

here is that rHo and rSo are only very weakly dependent on Temperatute

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