Docsity
Docsity

Prepare for your exams
Prepare for your exams

Study with the several resources on Docsity


Earn points to download
Earn points to download

Earn points by helping other students or get them with a premium plan


Guidelines and tips
Guidelines and tips

Quiz 6 with Answer Key - General Chemistry II | CHEM 209, Quizzes of Chemistry

Material Type: Quiz; Professor: DiLella; Class: General Chemistry II; Subject: Chemistry; University: Shepherd University; Term: Spring 2008;

Typology: Quizzes

Pre 2010

Uploaded on 08/16/2009

koofers-user-hm1
koofers-user-hm1 🇺🇸

10 documents

1 / 3

Toggle sidebar

This page cannot be seen from the preview

Don't miss anything!

bg1
Chem 209 KEY Quiz 6 TAKEHOME
DUE 3/10/08
1. Write the Kc and Kp expression for the reactions below.
2Cl2(g) + 2H2O(g) 4 HCl(g) + O2(g)
2
2
2
2
2
4
c
OHCl
OHCl
K
2
OH
2
Cl
O
4
HCl
p
22
2
PP
PP
K
4 CuO(s) + CCl4(g) CO2(g) + 4 Cu(s) + 2 Cl2O(g)
4
2
22
c
CCl
OClCO
K
4
22
CCl
2
OClCO
p
P
PP
K
SO3(g) SO2(g) + ½ O2(g)
3
2
1
22
c
SO
OSO
K
3
22
SO
2
1
OSO
p
P
PP
K
P4(s) + 10 Cl2(g) 4 PCl5(s)
10
2
c
Cl
1
K
10
Cl
p
2
P
1
K
CCl4(l)  C(s) + 2 Cl2(g)
2
2c
ClK
________________________________________________________________________
2. For which of the following reactions does Kp = Kc There may be more than one?
NH3(g) + 3O2(g) 2N2(g) + 6H2O(l)
3 H2(g) + N2(g) 2NH3(g)
CO(g) + Cl 2(g) COCl(g) +Cl(g)
H2(g) + I2(g) 2 HI(g)
2 SO2(g) + O2(g) 2 SO3(g)
_____________________________________________________________________
3 Consider the following equilibrium?
NH4CO2NH2(s) 2 NH3(g) + CO2(g) Kp = 2.5 10 at 310 K
What are the equilibrium pressures of NH3 and CO2 at 310 K?
NH4CO2NH2(s) 2 NH3(g) +CO2(g)
initial - 0 0
change - 2x x
equil - 2x x
43
3
CO
2
NHp
105.2x4xx2PPK
23
2
3
4
1097.3
4
105.2
x
atm 1097.3xP
2
CO
2
atm 1094.7x2P
2
NH
3
1
pf3

Partial preview of the text

Download Quiz 6 with Answer Key - General Chemistry II | CHEM 209 and more Quizzes Chemistry in PDF only on Docsity!

DUE 3/10/

  1. Write the Kc and Kp expression for the reactions below.

2Cl 2 (g) + 2H 2 O(g)  4 HCl(g) + O 2 (g)

2

2

2

2

2

4

c

Cl H O

HCl O

K  2

H O

2

Cl

O

4

HCl

p

2 2

2

P P

P P

K 

4 CuO(s) + CCl 4 (g)  CO 2 (g) + 4 Cu(s) + 2 Cl 2 O(g)

4

2

2 2

c

CCl

CO Cl O

K 

4

2 2

CCl

2

CO Cl O

p

P

P P

K 

SO 3 (g)  SO 2 (g) + ½ O 2 (g)

3

2

1

2 2

c

SO

SO O

K 

3

2 2

SO

2

1

SO O

p

P

P P

K 

P 4 (s) + 10 Cl 2 (g) 4 PCl 5 (s)

10

2

c

Cl

K 

10

Cl

p

2

P

K 

CCl 4 (l)  C(s) + 2 Cl 2 (g)

2

c 2

K  Cl

2

p Cl 2

K  P

________________________________________________________________________

  1. For which of the following reactions does Kp = Kc There may be more than one?

NH 3 (g) + 3O 2 (g) 2N 2 (g) + 6H 2 O(l)

3 H 2 (g) + N 2 (g)  2NH 3 (g)

CO(g) + Cl 2 (g)  COCl(g) +Cl(g)

H 2 (g) + I 2 (g)2 HI(g)

2 SO 2 (g) + O 2 (g)  2 SO 3 (g)

_____________________________________________________________________

3 Consider the following equilibrium?

NH 4 CO 2 NH 2 (s)  2 NH 3 (g) + CO 2 (g) Kp = 2.5  10

 at 310 K

What are the equilibrium pressures of NH 3 and CO 2 at 310 K?

NH 4 CO 2 NH 2 (s)

2 NH 3 (g) + CO 2 (g)

initial - 0 0

change - 2x x

equil - 2x x

(^334)

CO

2

p NH

K P P 2 x x 4 x 2. 5 10

3 2

2 3

4

x

P x 3. 97 10 atm

2

CO 2

P 2 x 7. 94 10 atm

2

NH 3

DUE 3/10/

___________________________________________________

  1. Consider the exothermic reaction 4 NO 2 (g) + O 2 (g)  2 N 2 O 5 (g).

Indicate the effect of the following stresses on the equilibrium.

(shift to products, shift to reactants, no effect)

a) a decrease in the pressure of NO 2 (shifts to reactants)

b) an increase in the pressure of N 2 O 5 (shifts to reactants)

c) a decrease in temperature. (shift to products)

d) addition of a catalyst (no effect)

e) an increase in the volume of the container holding the gases. (shifts to reactants)

______________________________________________________________________

  1. Consider the reaction 4 CuO(s) + CCl 4 (g)  CO 2 (g) + 4 Cu(s) + 2 Cl 2 O(g). Kp at 400

°C is 625 for this reaction. Write the algebraic equation needed to solve for the equilibrium

pressures of CCl 4 (g), CO 2 (g), and Cl 2 O(g) at 400 °C. Assume initially that the concentrations

are 1.0 atm for CCl 4 (g) , 2.0 atm for CO 2 (g) and 3.0 atm for Cl 2 O(g).

4 CuO(s) + CCl 4 (g)

CO 2 (g) + 4 Cu(s) + 2 Cl 2 O(g)

initial - 1.0 2.0 - 3.

change - x x - 2x

equil - 1.0 - x 2.0 - x - 3.0 - 2x

   

 

1. 0 x

3. 0 2 x 2. 0 x

P

P P

K

2

CCl

CO

2

Cl O

p

4

2 2

_______________________________________________________________________

  1. For the reaction 2 SO 2 (g) + O 2 (g)  2 SO 3 (g), Kc = 0.200 at 100 °C.

If 1.0 moles of SO 2 is mixed with 0.50 moles of SO 3 and 0.50 moles of O 2 in a 5.0 L

chamber, will there be more or less than 1.0 mole of SO 2 when equilibrium is reached. (Hint:

use the reaction quotient to determine the answer)

  0. 10 M

5 L

  1. 50 mol

SO 3

    0. 20 M

5 L

  1. 0 mol

SO 2

    0. 10 M

5 L

  1. 50 mol

O 2

 

   

 

   

  1. 5

  2. 2 0. 1

  3. 1

SO O

SO

Q 2

2

2

2

2

2

3   

since Q > K there are too many products and thus will be more SO 2 (s) at equilibrium

_______________________________________________________________________

  1. Find the concentration of Mg

2+ ions in a saturated solution of MgF 2 (Ksp = 6.6x

  • )

__________________________________________________________________________

MgF 2 (s)

Pb

2+

+ 2F

i 0 0

c x 2x

e x 2x

  

2 3 2 2

sp K  Mg F x( 2 x)  4 x

 

3

3

1 9 3

1

sp

  1. 2 10

4

  1. 6 10

4

K

x

  

   

 

[Mg

2+

] = x = 1.2 10

