Question 1

Calculate the concentration of argon in lake water at 20F1F1F1S1?F1F1F10C .The partial pressure of argon is 0.0090 atm and Henrys constant is 0.0015 molF1F1F1S1?F1F1F10LF1F1F1S1?F1F1F101F1F1F1S1?F1F1F10atmF1F1F1S1?F1F1F101.

Accepted Answer

A)  1.5 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F103 M 
B)  9.0 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F103 M 
C)  1.4 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F105 M 
D)  6.0 M 
E)  0.17 M 
A)  1.5 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F103 M 
B)  9.0 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F103 M 
C)  1.4 F1F1F1S1?F1F1F10 10F1F1F1S1?F1F1F105 M 
D)  6.0 M 
E)  0.17 M C

Question 2

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. 
A)  remains the same. 
B)  becomes larger. 
C)  becomes smaller. A

Question 3

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

Question 4

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 m 
A)  0.282 m 
B)  1.13 m 
C)  7.60 m 
D)  5.64 m 
E)  1.90 m

Question 5

Consider the reaction
CO(g)+ 2H2(g) 
$f$
CH3OH(g)
At room temperature,K is approximately 2 F1F1F1S1?F1F1F10 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. 
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.

Question 6

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. 
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.

Question 7

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 8

The vapor pressure of benzene at 25$\omicron$C is 94.6 Torr and its enthalpy of vaporization is 30.8 kJF1F1F1S1.F1F1F10molF1F1F1S1-F1F1F101 . 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. 
A)  640 K 
B)  358 K 
C)  470 K 
D)  624 K 
E)  Not enough information given.

Question 9

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 10

The freezing point of seawater is about F1F1F1S1-F1F1F101.85$\omicron$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 
A)  1.99 m 
B)  0.995 m 
C)  3.44 m 
D)  3.70 m 
E)  0.497 m

Question 11

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 kJF1F1F1S1?F1F1

Question 12

What is the relationship between K and Kc for the reaction below?
2HgO(s)F1S1S1W1?F1F1F10 2Hg(l)+ O2(g)

Accepted Answer

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

Question 13

At 25F1F1F1S1?F1F1F10C, F1F1F1S1?F1F1F10Gro for the reaction 2SO2(g)+ O2(g) $f$
 2SO3(g) Is F1F1F1S1-F1F1F10141.74 kJ·molF1F1F1S1-F1F1F101.Calculate the value of Kc for this reaction.

Accepted Answer

A)  1.74 F1F1F1S1*F1F1F10 1026 
B)  7.01 F1F1F1S1*F1F1F10 1024 
C)  2.65 F1F1F1S1*F1F1F10 1012 
D)  6.56 F1F1F1S1*F1F1F10 1013 
A)  1.74 F1F1F1S1*F1F1F10 1026 
B)  7.01 F1F1F1S1*F1F1F10 1024 
C)  2.65 F1F1F1S1*F1F1F10 1012 
D)  6.56 F1F1F1S1*F1F1F10 1013

Question 14

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) CH3CH2OH 
A)  Br2  
B)  carbon tetrachloride, CCl4 
C)  CS2 
D)  ethanol 
E) CH3CH2OH

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

Question 16

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 17

Given: 2P(g) + 3Cl2(g)F1S1S1W1?F1F1F10 2PCl3(g)
K = 15.0
PCl3(g)+ Cl2(g)F1S1S1W1?F1F1F10 PCl5(g)
K = 4.0
What is the value of the equilibrium constant for the reaction below?
2P(g)+ 5Cl2(g)F1S1S1W1?F1F1F10 2PCl5(g)

Accepted Answer

A)  60 
B)  240 
C)  1.1 
D)  3600 
E)  23 
A)  60 
B)  240 
C)  1.1 
D)  3600 
E)  23

Question 18

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

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

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

Question 20

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 C6H6 
A)  ethanol, CH3CH2OH 
B)  carbon tetrachloride, CCl4 
C)  Br2  
D)  CS2  
E)  benzene C6H6

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.

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

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

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.

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?

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

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.

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.

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

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.

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.

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

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.

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

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?

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.

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)

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

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

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

Atoms

Molecules

States of Matter

Thermodynamics

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

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Exam 5: Equilibrium

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.

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

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

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.

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?

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

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.

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.

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

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.

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.

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

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.

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

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?

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.

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)

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

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

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

Atoms

Molecules

States of Matter

Thermodynamics

Reactions

Kinetics

The Main-Group Elements

The D-Block Elements

Nuclear Chemistry

Organic Chemistry

Filters

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.

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.

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?

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.

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.

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.

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.

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

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.

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?

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.

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)

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

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