equilibrium

Equilibrium

Kc and KP

At a temperature of 700 K, the equilibrium constant is 3.164 x 103 for the following reaction:

C2H4(g) + H2(g) ↔ C2H6(g)What will be the equilibrium concentration of ethene

if the concentration of H2 is 0.0619 M and the concentration of C2H6 is 1.055 M?

2.4

5 x

10-1

2 M

1.9

8 x

10-7

M

5.3

9 x

10-3

M

0.1

97 M

1.5

3 x

103

M

0% 0% 0%0%

100%

1. 2.45 x 10-12 M2. 1.98 x 10-7 M3. 5.39 x 10-3 M4. 0.197 M5. 1.53 x 103 M

1 2 3 4

The equilibrium constant of the following reaction for the decomposition of phosgene at 25oC is

4.282 x 10-2.COCl2(g) ↔ CO(g) + Cl2(g)

What is the concentration of COCl2 when the concentrations of both products are 5.90 x 10-3 M?

.012

6 M

.091

98 M

1.2

8 x

10-6

M

3.9

7 x

10-5

M

8.1

3 x

10-4

M

0% 0%

100%

0%0%

1. .0126 M2. .09198 M3. 1.28 x 10-6 M 4. 3.97 x 10-5 M5. 8.13 x 10-4 M

1 2 3 4

Which of the following represents the correct equilibrium expression for the synthesis of carbon

monoxide?2C(s) + O2(g) ↔ 2CO(g)

Kc

= [CO]2

/([C

]2[O

2])

Kc

= [C]2

[O2]

/ [C

O]2

Kc

= [O2]

/ [C

O]2

Kc

= [CO]2

/ [O

2]

Kc

= [CO] /

([C][O

2])

75%

0% 0%

25%

0%

1. Kc = [CO]2 /([C]2[O2])

2. Kc = [C]2[O2] / [CO]2

3. Kc = [O2] / [CO]2

4. Kc = [CO]2 / [O2]

5. Kc = [CO] /([C][O2])

1 2 3 4

Determine the value of Kc for the following reaction:2NO2(g) ↔ 2NO(g) + O2(g)

Kp = 6.76 x 10-5

6.2

3 x

10-8

1.8

0 x

10-6

1.1

8 x

10-5

5.6

9 x

10-4

.036

1

0%

100%

0%0%0%

1. 6.23 x 10-8

2. 1.80 x 10-6

3. 1.18 x 10-5

4. 5.69 x 10-4

5. 0.0361

1 2 3 4

Predict the effect that decreasing the pressure will have on the following reaction system.

H2(g) + Cl2(g) ↔ 2HCl(g)

mor

e HCl w

ill b

e fo

rmed

mor

e H2

and

Cl2 w

ill...

it w

ill s

peed

up th

e re

...

it w

ill s

low d

own

the

...

it is

imposs

ible

to p

re...

0% 0% 0%

67%

33%

1. more HCl will be formed2. more H2 and Cl2 will form

3. it will speed up the reaction, but the relative amounts of substances won’t change

4. it will slow down the reaction, but the relative amounts of substances won’t change

5. it is impossible to predict

1 2 3 4

Predict the effect that decreasing the pressure will have on the following reaction system.

3O2(g) ↔ 2O3(g)

mor

e O2

will b

e fo

rmed

mor

e O3

will b

e fo

rmed

it w

ill s

peed

up th

e re

...

it w

ill s

low d

own

the

...

it is

imposs

ible

to p

re...

50% 50%

0%0%0%

1. more O2 will be formed

2. more O3 will be formed




1 2 3 4

Predict the effect that increasing the pressure will have on the following reaction system.

2H2O2(aq) ↔ 2H2O(l) + O2(g)

mor

e H2O

and O

2 will

..

mor

e H2O

2 w

ill b

e f..

.

it w

ill s

peed

up th

e re

...

it w

ill s

low d

own

the

...

it is

imposs

ible

to p

re...

25%

75%

0%0%0%

1. more H2O and O2 will be formed

2. more H2O2 will be formed




1 2 3 4

What will be the effect on the following reaction system if copper(II) chloride is added?2Al(s) + 3Cu2+(aq) ↔ 3Cu(s) + 2Al3+(aq)

mor

e so

lid c

opper

an...

mor

e so

lid a

lum

inum

...

no e

ffect

sin

ce c

opper

(I..

imposs

ible

to p

redi

ct

the

world w

ill s

top ro

t...

75%

0%

25%

0%0%

1. more solid copper and aluminum ions will be produced

2. more solid aluminum and copper ions will be produced

3. no effect since copper(II) chloride is not involved in the reaction

4. impossible to predict5. the world will stop rotating about its

axis, so please don’t do it

1 2 3 4

0.05 mol of solid HgCl2 is vaporized in a 1.00 L evacuated flask at 680 K. What is the pressure inside

the flask?

0.0

5 at

m

1.0

0 at

m

2.0

atm

2.8

atm

3.2

atm

0% 0% 0%

100%

0%

1. 0.05 atm2. 1.00 atm3. 2.0 atm4. 2.8 atm5. 3.2 atm

1 2 3 4

Select the molecule that has all of its atoms in the same plane.

BCl3

CH4

SF6

NH3

PCl3

0% 0%

75%

25%

0%

1. BCl3

2. CH4

3. SF6

4. NH3

5. PCl3

1 2 3 4

equilibrium

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