Arrows in the energy diagram below represent enthalpy changes occurring in the endothermic formation of a solution: ΔHS1U1B1solnS1U1B0 = enthalpy of solution ΔHS1U1B1solute-soluteS1U1B0 = enthalpy change involving solute-solute interactions ΔHS1U1B1solute-solventS1U1B0 = enthalpy change involving solute-solvent interactions ΔHS1U1B1solvent-solventS1U1B0 = enthalpy change involving solvent-solvent interactions -Which arrows represent ΔHsolute-solute and ΔHsolvent-solvent?

A) arrow (a)and arrow (b) B) arrow (a)and arrow (c) C) arrow (a)and arrow (d) D) arrow (c)and arrow (d) A) arrow (a)and arrow (b) B) arrow (a)and arrow (c) C) arrow (a)and arrow (d) D) arrow (c)and arrow (d)

In which case should CO2(g)be more soluble in water?

A) The total pressure is 5 atm and the partial pressure of CO2 is 0.4 atm. B) The total pressure is 3 atm and the partial pressure of CO2 is 0.6 atm. C) The total pressure is 1 atm and the partial pressure of CO2 is 0.3 atm. D) The total pressure is 1 atm and the partial pressure of CO2 is 0.5 atm. A) The total pressure is 5 atm and the partial pressure of CO2 is 0.4 atm. B) The total pressure is 3 atm and the partial pressure of CO2 is 0.6 atm. C) The total pressure is 1 atm and the partial pressure of CO2 is 0.3 atm. D) The total pressure is 1 atm and the partial pressure of CO2 is 0.5 atm.

What volume of 3.00 M CH3OH solution is needed to provide 0.500 mol of CH3OH?

A) 3.12 mL B) 9.38 mL C) 167 mL D) 150 mL A) 3.12 mL B) 9.38 mL C) 167 mL D) 150 mL

Calculate the freezing point of a solution of 30.0 g methyl salicylate,C7H6O2,dissolved in 800.g of benzene,C6H6.Kf for benzene is 5.10°C/m and the freezing point is 5.50°C for benzene.

A) -1.56°C B) 1.56°C C) 3.93°C D) 7.06°C A) -1.56°C B) 1.56°C C) 3.93°C D) 7.06°C

A 3.17 m solution of CaCl2 in water has a density of 1.24 g/mL.What is the molarity?

A) 2.56 M CaCl2 B) 2.91 M CaCl2 C) 3.50 M CaCl2 D) 3.93 M CaCl2 A) 2.56 M CaCl2 B) 2.91 M CaCl2 C) 3.50 M CaCl2 D) 3.93 M CaCl2

Exam 12: Solutions and Their Properties

Amphetamines in urine can be confirmed by mass spectroscopy at a concentration of 500 ng/mL.Assuming a urine density of 1.025 g/mL,what is this concentration in parts per million?

(Short Answer)

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Question 161

At a given temperature the vapor pressures of benzene and toluene are 183 mm Hg and 59.2 mm Hg,respectively.Calculate the mole fraction of benzene in the vapor phase over a solution of benzene and toluene with X_benzene = 0.600.

(Multiple Choice)

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Question 162

Arrows in the energy diagram below represent enthalpy changes occurring in the endothermic formation of a solution: ΔH_soln = enthalpy of solution ΔH_{solute-solute} = enthalpy change involving solute-solute interactions ΔH_{solute-solvent} = enthalpy change involving solute-solvent interactions ΔH_{solvent-solvent} = enthalpy change involving solvent-solvent interactions -Which arrows represent ΔH_{solute-solute} and ΔH_{solvent-solvent}?

(Multiple Choice)

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Question 163

-What is the approximate boiling temperature of the liquid formed from the condensation of the vapor above a boiling solution that is 0.70 X_A and 0.30 X_B?

(Multiple Choice)

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Question 164

If dissociation of MgCl₂ in water were 100%,the van't Hoff factor would be ;however,for real solutions the van't Hoff factor for MgCl₂ is (greater than,less than)this value.

(Short Answer)

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Question 165

The vapor pressure of water at 25°C is 23.8 mm Hg.The vapor pressure lowering,ΔP,of an aqueous solution containing 0.500 mole fraction NaCl is ________ (equal to,greater than,less than)11.9 mm Hg?

(Short Answer)

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Question 166

In the process of dissolving ionic compounds,the cations and anions are separated from the crystal lattice and surrounded by an ordered shell of solvent molecules.If the solvent is water,the dissolved ions are said to be

(Multiple Choice)

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Question 167

In which case should CO₂(g)be more soluble in water?

(Multiple Choice)

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Question 168

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,at what approximate temperature will the mixture begin to boil?

(Multiple Choice)

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Question 169

Molarity is defined as ,whereas molality is defined as .

(Essay)

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Question 170

What volume of 3.00 M CH₃OH solution is needed to provide 0.500 mol of CH₃OH?

(Multiple Choice)

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Question 171

Calculate the freezing point of a solution of 30.0 g methyl salicylate,C₇H₆O₂,dissolved in 800.g of benzene,C₆H₆.K_f for benzene is 5.10°C/m and the freezing point is 5.50°C for benzene.

(Multiple Choice)

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Question 172

When an ionic solute dissolves in water to form an unsaturated solution,the free energy change (ΔG_soln)is

(Multiple Choice)

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Question 173

When two similar liquids mix to form a solution,the entropy of solution (ΔS_soln)is expected to be

(Multiple Choice)

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Question 174

A 0.020 m aqueous solution containing which solute will have the lowest freezing point?

(Multiple Choice)

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Question 175

A 3.17 m solution of CaCl₂ in water has a density of 1.24 g/mL.What is the molarity?

(Multiple Choice)

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Question 176

Arrows in the energy diagram below represent enthalpy changes occurring in the exothermic formation of a solution: ΔH_soln = enthalpy of solution ΔHsolute-solute = enthalpy change involving solute-solute interactions ΔHsolute-solvent = enthalpy change involving solute-solvent interactions ΔHsolvent-solvent = enthalpy change involving solvent-solvent interactions -Which arrows represent ΔH_{solute-solute} and ΔH_{solvent-solvent}?

(Multiple Choice)

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Question 177

Which of the following solutions will have the lowest freezing point?

(Multiple Choice)

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Question 178

A solution is made by dissolving 19.5 g of sucrose,C₁₂H₂₂O₁₁,in 117 g of water,producing a solution with a volume of 125 mL at 20°C.What is the expected osmotic pressure at 20°C?

(Multiple Choice)

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Question 179

How many grams of KBr are required to make 250.mL of a 0.115 M KBr solution?

(Multiple Choice)

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Question 180

Showing 161 - 180 of 198

Exam 12: Solutions and Their Properties

Amphetamines in urine can be confirmed by mass spectroscopy at a concentration of 500 ng/mL.Assuming a urine density of 1.025 g/mL,what is this concentration in parts per million?

At a given temperature the vapor pressures of benzene and toluene are 183 mm Hg and 59.2 mm Hg,respectively.Calculate the mole fraction of benzene in the vapor phase over a solution of benzene and toluene with Xbenzene = 0.600.

-What is the approximate boiling temperature of the liquid formed from the condensation of the vapor above a boiling solution that is 0.70 XA and 0.30 XB?

If dissociation of MgCl2 in water were 100%,the van't Hoff factor would be ________;however,for real solutions the van't Hoff factor for MgCl2 is ________ (greater than,less than)this value.

The vapor pressure of water at 25°C is 23.8 mm Hg.The vapor pressure lowering,ΔP,of an aqueous solution containing 0.500 mole fraction NaCl is ________ (equal to,greater than,less than)11.9 mm Hg?

In the process of dissolving ionic compounds,the cations and anions are separated from the crystal lattice and surrounded by an ordered shell of solvent molecules.If the solvent is water,the dissolved ions are said to be

In which case should CO2(g)be more soluble in water?

A phase diagram of temperature versus composition for a mixture of the two volatile liquids octane (bp = and decane (bp = 126°C)is shown. -Assume that you start with a mixture containing 0.80 mol of decane and 0.20 mol of octane,at what approximate temperature will the mixture begin to boil?

Molarity is defined as ________,whereas molality is defined as ________.

What volume of 3.00 M CH3OH solution is needed to provide 0.500 mol of CH3OH?

Calculate the freezing point of a solution of 30.0 g methyl salicylate,C7H6O2,dissolved in 800.g of benzene,C6H6.Kf for benzene is 5.10°C/m and the freezing point is 5.50°C for benzene.

When an ionic solute dissolves in water to form an unsaturated solution,the free energy change (ΔGsoln)is

When two similar liquids mix to form a solution,the entropy of solution (ΔSsoln)is expected to be

A 0.020 m aqueous solution containing which solute will have the lowest freezing point?

A 3.17 m solution of CaCl2 in water has a density of 1.24 g/mL.What is the molarity?

Which of the following solutions will have the lowest freezing point?

A solution is made by dissolving 19.5 g of sucrose,C12H22O11,in 117 g of water,producing a solution with a volume of 125 mL at 20°C.What is the expected osmotic pressure at 20°C?

How many grams of KBr are required to make 250.mL of a 0.115 M KBr solution?

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At a given temperature the vapor pressures of benzene and toluene are 183 mm Hg and 59.2 mm Hg,respectively.Calculate the mole fraction of benzene in the vapor phase over a solution of benzene and toluene with X_benzene = 0.600.

-What is the approximate boiling temperature of the liquid formed from the condensation of the vapor above a boiling solution that is 0.70 X_A and 0.30 X_B?

If dissociation of MgCl₂ in water were 100%,the van't Hoff factor would be ;however,for real solutions the van't Hoff factor for MgCl₂ is (greater than,less than)this value.

In which case should CO₂(g)be more soluble in water?

Molarity is defined as ,whereas molality is defined as .

What volume of 3.00 M CH₃OH solution is needed to provide 0.500 mol of CH₃OH?

Calculate the freezing point of a solution of 30.0 g methyl salicylate,C₇H₆O₂,dissolved in 800.g of benzene,C₆H₆.K_f for benzene is 5.10°C/m and the freezing point is 5.50°C for benzene.

When an ionic solute dissolves in water to form an unsaturated solution,the free energy change (ΔG_soln)is

When two similar liquids mix to form a solution,the entropy of solution (ΔS_soln)is expected to be

A 3.17 m solution of CaCl₂ in water has a density of 1.24 g/mL.What is the molarity?

A solution is made by dissolving 19.5 g of sucrose,C₁₂H₂₂O₁₁,in 117 g of water,producing a solution with a volume of 125 mL at 20°C.What is the expected osmotic pressure at 20°C?