Question 1

With which of the following solutes can water most readily hydrogen bond?

Accepted Answer

A)   ethanol, CH3CH2OH
B)   carbon tetrachloride, CCl4
C)   Br2 
D)   CS2 
E)   benzene C6H6F) A) and B)
G) A) and C)

Question 2

Given: 2P(g)  + 3Cl2(g) ? 2PCl3(g) 
K = 15.0
PCl3(g) + Cl2(g) ? PCl5(g) 
K = 4.0
What is the value of the equilibrium constant for the reaction below?
2P(g) + 5Cl2(g) ? 2PCl5(g)

Accepted Answer

A)   60
B)   240
C)   1.1
D)   3600
E)   23F) All of the above
G) C) and D)

Question 3

Consider the reaction
CO(g) + 2H2(g)  
 fff 
CH3OH(g) 
At room temperature,K is approximately 2 ? 104,But at a higher temperature K is substantially smaller.Which of the following is true?

Accepted Answer

A)   The reaction is endothermic.
B)   The value of Kc for this reaction is smaller at all temperatures.
C)   At the higher temperature, more CH3OH(g)  is produced.
D)   The reaction is exothermic.
E)   The reaction becomes spontaneous at higher temperatures. F) B) and D)
G) B) and E)

Question 4

Of the following solutes, which is likely to be most soluble in water?

Accepted Answer

A)   Br2 
B)   carbon tetrachloride, CCl4
C)   CS2
D)   ethanol
E)  CH3CH2OHF) B) and D)
G) A) and B)

Question 5

At the normal boiling point of chlorine,
238.5 K,?H of vaporization is 20.4 kJF1F1F1S1.F1F1F10molF1F1F1S1-F1F1F101.For the reversible vaporization of 1 mol of chlorine at 238.5 K and a constant pressure of 1 atm,
determine q,?S,and ?G.

Accepted Answer

20.4 kJ<font face="symbol">?F1F1...

Question 6

Aqueous ammonia (28%)is 15.0 M and has a density of 0.90 gF1F1F1S1.F1F1F10mLF1F1F1S1-F1F1F101.Calculate the molality of ammonia in this solution.

Accepted Answer

Question 7

The phase diagram for a pure substance is given below.  What pressure must be applied to liquefy a sample at 425 K?

Accepted Answer

A)   350 atm
B)   The sample cannot be liquefied at 425 K.
C)   150 atm
D)   50 atm
E)   250 atmF) A) and B)
G) B) and E) B

Question 8

In a closed vessel containing water the pressure is 18 Torr .If more water is added to the vessel,The pressure

Accepted Answer

A)   remains the same.
B)   becomes larger.
C)   becomes smaller.D) None of the above
E) All of the above A

Question 9

The vapor pressure of benzene at 25 ο\omicronο C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol-1 . Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

Accepted Answer

A)   640 K
B)   358 K
C)   470 K
D)   624 K
E)   Not enough information given. F) A) and B)
G) A) and E)

Question 10

The phase diagram for sulfur is given below.  At 424 K and 1300 atm,

Accepted Answer

A)   rhombic sulfur, monoclinic sulfur, sulfur liquid, and sulfur gas exist in equilibrium.
B)   only rhombic sulfur and sulfur gas exist in equilibrium.
C)   rhombic sulfur, monoclinic sulfur, and liquid sulfur exist in equilibrium.
D)   only rhombic sulfur is present.
E)   only monoclinic sulfur is present.F) A) and E)
G) D) and E)

Question 11

What is the relationship between K and Kc for the reaction below?
2HgO(s) ? 2Hg(l) + O2(g)

Accepted Answer

A)   Kc = (RT) 2K
B)   K = Kc 
C)   Kc = RTK
D)   K = RTKc 
E)   K = (RT) 2Kc F) A) and B)
G) C) and D)

Question 12

Calculate the concentration of argon in lake water at 20?C .The partial pressure of argon is 0.0090 atm and Henrys constant is 0.0015 mol?L?1?atm?1.

Accepted Answer

A)   1.5 ? 10?3 M
B)   9.0 ? 10?3 M
C)   1.4 ? 10?5 M
D)   6.0 M
E)   0.17 MF) C) and E)
G) C) and D) C

Question 13

The freezing point of seawater is about -1.85 ο\omicronο C .If seawater is an aqueous solution of sodium chloride,Calculate the molality of seawater.The kf for water is 1.86 K/m.

Accepted Answer

A)   1.99 m
B)   0.995 m
C)   3.44 m
D)   3.70 m
E)   0.497 m F) A) and B)
G) All of the above

Question 14

Consider the phase diagram for CO2 in the text on page 315.A sample of carbon dioxide at 10$\omicron$C and 10 atm is a liquid.

Accepted Answer

A) True 
 B)False

Question 15

Using a mass of 500.0 g of water, what is the molality of NaClO4 in a solution made using 125 g of sodium perchlorate monohydrate?

Accepted Answer

A)   1.78 m
B)   3.56 m
C)   0.900 m
D)   2.04 m
E)   0.250 mF) A) and B)
G) C) and E)

Question 16

Consider the reaction
4NH3(g) + 3O2(g)   fff 
2N2(g) + 6H2O(g) ,
K = 1080 at a certain temperature.
Initially,All reactants and products have concentrations equal to 12 M.
At equilibrium,The approximate concentration of ammonia is

Accepted Answer

A)   6 M.
B)   3 M.
C)   12 M.
D)   18 M.
E)   0 M. F) B) and C)
G) A) and B)

Question 17

At 25?C, ?Gro for the reaction 2SO2(g) + O2(g)   fff 
 2SO3(g)  Is -141.74 kJ·mol-1.Calculate the value of Kc for this reaction.

Accepted Answer

A)   1.74 * 1026
B)   7.01 * 1024
C)   2.65 * 1012
D)   6.56 * 1013 E) All of the above
F) None of the above

Question 18

What is the molality of CrCl3 in a solution prepared by dissolving 75.2 g of chromium(III)  chloride hexahydrate in 250.0 g of water.

Accepted Answer

A)   0.282 m
B)   1.13 m
C)   7.60 m
D)   5.64 m
E)   1.90 mF) C) and D)
G) All of the above

Question 19

What is the molality of carbon tetrachloride in a solution of toluene,given that the mole fraction is 0.200?

Accepted Answer

The answer of What is the molality of carbon tetrachloride...

Question 20

An endothermic reaction is most likely to have a small equilibrium constant if $\Delta$Sro is small

Accepted Answer

A) True 
 B)False

Exam 5: Equilibrium

With which of the following solutes can water most readily hydrogen bond?

Correct AnswerverifiedShow Answer

Given: 2P(g) + 3Cl2(g) ? 2PCl3(g) K = 15.0 PCl3(g) + Cl2(g) ? PCl5(g) K = 4.0 What is the value of the equilibrium constant for the reaction below? 2P(g) + 5Cl2(g) ? 2PCl5(g)

Correct AnswerverifiedShow Answer

Consider the reaction CO(g) + 2H2(g) fff CH3OH(g) At room temperature,K is approximately 2 ? 104,But at a higher temperature K is substantially smaller.Which of the following is true?

Correct AnswerverifiedShow Answer

Of the following solutes, which is likely to be most soluble in water?

Correct AnswerverifiedShow Answer

At the normal boiling point of chlorine, 238.5 K,?H of vaporization is 20.4 kJ.mol-1.For the reversible vaporization of 1 mol of chlorine at 238.5 K and a constant pressure of 1 atm, determine q,?S,and ?G.

Correct Answerverified20.4 kJ?F1F1...View AnswerShow Answer

Aqueous ammonia (28%)is 15.0 M and has a density of 0.90 g.mL-1.Calculate the molality of ammonia in this solution.

Correct AnswerverifiedShow Answer

The phase diagram for a pure substance is given below. What pressure must be applied to liquefy a sample at 425 K?

Correct AnswerverifiedB

In a closed vessel containing water the pressure is 18 Torr .If more water is added to the vessel,The pressure

Correct AnswerverifiedA

The vapor pressure of benzene at 25 ο\omicronο C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol-1 . Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

Correct AnswerverifiedShow Answer

The phase diagram for sulfur is given below. At 424 K and 1300 atm,

Correct AnswerverifiedShow Answer

What is the relationship between K and Kc for the reaction below? 2HgO(s) ? 2Hg(l) + O2(g)

Correct AnswerverifiedShow Answer

Calculate the concentration of argon in lake water at 20?C .The partial pressure of argon is 0.0090 atm and Henrys constant is 0.0015 mol?L?1?atm?1.

Correct AnswerverifiedC

The freezing point of seawater is about -1.85 ο\omicronο C .If seawater is an aqueous solution of sodium chloride,Calculate the molality of seawater.The kf for water is 1.86 K/m.

Correct AnswerverifiedShow Answer

Consider the phase diagram for CO2 in the text on page 315.A sample of carbon dioxide at 10 ο\omicronο C and 10 atm is a liquid.

Correct AnswerverifiedShow Answer

Using a mass of 500.0 g of water, what is the molality of NaClO4 in a solution made using 125 g of sodium perchlorate monohydrate?

Correct AnswerverifiedShow Answer

Consider the reaction 4NH3(g) + 3O2(g) fff 2N2(g) + 6H2O(g) , K = 1080 at a certain temperature. Initially,All reactants and products have concentrations equal to 12 M. At equilibrium,The approximate concentration of ammonia is

Correct AnswerverifiedShow Answer

At 25?C, ?Gro for the reaction 2SO2(g) + O2(g) fff 2SO3(g) Is -141.74 kJ·mol-1.Calculate the value of Kc for this reaction.

Correct AnswerverifiedShow Answer

What is the molality of CrCl3 in a solution prepared by dissolving 75.2 g of chromium(III) chloride hexahydrate in 250.0 g of water.

Correct AnswerverifiedShow Answer

What is the molality of carbon tetrachloride in a solution of toluene,given that the mole fraction is 0.200?

Correct AnswerverifiedShow Answer

An endothermic reaction is most likely to have a small equilibrium constant if Δ\DeltaΔ Sro is small

Correct AnswerverifiedShow Answer

Correct Answer
verified

Given: 2P(g) + 3Cl₂(g) ? 2PCl₃(g) K = 15.0 PCl₃(g) + Cl₂(g) ? PCl₅(g) K = 4.0 What is the value of the equilibrium constant for the reaction below? 2P(g) + 5Cl₂(g) ? 2PCl₅(g)

Correct Answer
verified

Consider the reaction CO(g) + 2H₂(g) $f$ CH₃OH(g) At room temperature,K is approximately 2 ? 10⁴,But at a higher temperature K is substantially smaller.Which of the following is true?

Correct Answer
verified

Correct Answer
verified

At the normal boiling point of chlorine, 238.5 K,?H of vaporization is 20.4 kJ.mol^-¹.For the reversible vaporization of 1 mol of chlorine at 238.5 K and a constant pressure of 1 atm, determine q,?S,and ?G.

Correct Answer
verified
20.4 kJ?F1F1...
View Answer

Aqueous ammonia (28%)is 15.0 M and has a density of 0.90 g.mL^-¹.Calculate the molality of ammonia in this solution.

Correct Answer
verified

Correct Answer
verified
B

Correct Answer
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A

The vapor pressure of benzene at 25^$\omicron$C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJ.mol^-¹ . Estimate the normal boiling point of benzene.Assume the enthalpy of vaporization is independent of temperature.

Correct Answer
verified

Correct Answer
verified

What is the relationship between K and K_c for the reaction below? 2HgO(s) ? 2Hg(l) + O₂(g)

Correct Answer
verified

Calculate the concentration of argon in lake water at 20?C .The partial pressure of argon is 0.0090 atm and Henrys constant is 0.0015 mol?L^?¹?atm^?¹.

Correct Answer
verified
C

The freezing point of seawater is about -1.85^$\omicron$C .If seawater is an aqueous solution of sodium chloride,Calculate the molality of seawater.The k_f for water is 1.86 K/m.

Correct Answer
verified

Consider the phase diagram for CO₂ in the text on page 315.A sample of carbon dioxide at 10^$\omicron$C and 10 atm is a liquid.

Correct Answer
verified

Using a mass of 500.0 g of water, what is the molality of NaClO₄ in a solution made using 125 g of sodium perchlorate monohydrate?

Correct Answer
verified

Consider the reaction 4NH₃(g) + 3O₂(g) $f$ 2N₂(g) + 6H₂O(g) , K = 10⁸⁰ at a certain temperature. Initially,All reactants and products have concentrations equal to 12 M. At equilibrium,The approximate concentration of ammonia is

Correct Answer
verified

At 25?C, ?G_r^o for the reaction 2SO₂(g) + O₂(g) $f$ 2SO₃(g) Is -141.74 kJ·mol^-¹.Calculate the value of K_c for this reaction.

Correct Answer
verified

What is the molality of CrCl₃ in a solution prepared by dissolving 75.2 g of chromium(III) chloride hexahydrate in 250.0 g of water.

Correct Answer
verified

Correct Answer
verified

An endothermic reaction is most likely to have a small equilibrium constant if $\Delta$ S_r^o is small

Correct Answer
verified