Calculate the vapour pressure of pure water at 65 °C if a 465 mL solution containing 123.0 g of ribose,C5H10O5,has a vapour pressure of 247.54 mbar.Assume no change in volume occurs upon dissolution.

A) 264 mbar B) 239 mbar C) 309 mbar D) 363 mbar E) 255 mbar A) 264 mbar B) 239 mbar C) 309 mbar D) 363 mbar E) 255 mbar

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? Kf for water is $1.86 ^ { \circ } \mathrm { Cm } ^ { - 1 }$

A) -0.140 °C B) -1.40 °C C) -2.80 °C D) -4.19 °C A) -0.140 °C B) -1.40 °C C) -2.80 °C D) -4.19 °C

Determine the vapour pressure of a solution at 28 °C that contains 62.5 g of fructose (C6H12O6)in 325.0 mL of water.The vapour pressure of pure water at 28 °C is 28.3 Torr.

A) 27.8 Torr B) 16.9 Torr C) 28.8 Torr D) 36.9 Torr E) 24.9 Torr A) 27.8 Torr B) 16.9 Torr C) 28.8 Torr D) 36.9 Torr E) 24.9 Torr

Exam 12: Solutions

Calculate the vapour pressure of pure water at 65 °C if a 465 mL solution containing 123.0 g of ribose,C₅H₁₀O₅,has a vapour pressure of 247.54 mbar.Assume no change in volume occurs upon dissolution.

(Multiple Choice)

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Question 81

At 20 °C,a 2.72 mol L^-1 aqueous solution of ammonium chloride has a density of $1.0687 \mathrm {~g} \mathrm {~mL} ^ { - 1 }$ What is the molality of ammonium chloride in the solution? The formula weight of $\mathrm { NH } _ { 4 }$ Cl is $53.50 \mathrm {~g} \mathrm {~mol} ^ { - 1 }$

(Multiple Choice)

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Question 82

What is the freezing point of a solution of 7.15 g MgCl₂ in 100 g of water? K_f for water is $1.86 ^ { \circ } \mathrm { Cm } ^ { - 1 }$

(Multiple Choice)

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Question 83

A mixture of pentane and hexane has a vapour pressure of 241 Torr.Calculate the mole fraction of pentane in the mixture.The vapour pressures of pure pentane and hexane are 425 Torr and 151 Torr,respectively.Assume ideal behaviour.

(Multiple Choice)

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Question 84

A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution.Which statement below is TRUE?

(Multiple Choice)

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Question 85

The boiling point of an aqueous 1.83 mol kg^-1 (NH₄)₂SO₄ (molar mass = 132.15 g mol^-1)solution is 102.5 °C.Determine the value of the van't Hoff factor for this solute if the K_b for water is 0.512 °C m^-1.

(Multiple Choice)

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Question 86

How many grams of KBr are required to make 350.mL of a 0.115 mol L^-1 KBr solution?

(Multiple Choice)

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Question 87

A solution containing less solute than the equilibrium amount is called

(Multiple Choice)

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Question 88

Parts per billion requires a multiplication factor of ________.

(Multiple Choice)

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Question 89

Calculate the total solution volume required to produce an osmotic pressure of 6.39 mbar using 12.34 mg of a protein with a molar mass of 5309 g mol^-1 at 25.0 °C.

(Multiple Choice)

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Question 90

What mass of NaCl is contained in 24.88 g of a 15.00% by mass solution of NaCl in water?

(Multiple Choice)

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Question 91

Determine the molality of an aqueous solution prepared by dissolving 0.112 moles of LiCl in 13.7 moles of H₂O.

(Multiple Choice)

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Question 92

Give the preparation of rock candy.

(Essay)

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Question 93

Solutions having osmotic pressures less than those of body fluids are called ________.

(Multiple Choice)

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Question 94

A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution.Calculate the mass % of the solution if the density of the solution is 1.06 g mL^-1.

(Multiple Choice)

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Question 95

Determine Δ_soluteH for KBr if the Δ_solutionHfor KBr is +19.9 kJ mol^-1 and the Δ_hydrationH for KBr is -670.kJ mol^-1.

(Multiple Choice)

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Question 96

Calculate the volume of solution that has a vapour pressure of 31.27 mbar and contains 84.3 g of sucrose,C₁₂H₂₂O₁₁,at a temperature of 25.0 °C.The vapour pressure of pure water at 25 °C is 31.7 mbar,the density of water is 1.00 g mL^-1,and assume no change in volume occurs upon dissolution.

(Multiple Choice)

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Question 97

Which of the following compounds will be most soluble in ethanol (CH₃CH₂OH)?

(Multiple Choice)

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Question 98

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C₈H₁₀N₄O₂,in 75 g of benzene,C₆H₆?

(Multiple Choice)

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Question 99

Determine the vapour pressure of a solution at 28 °C that contains 62.5 g of fructose (C₆H₁₂O₆)in 325.0 mL of water.The vapour pressure of pure water at 28 °C is 28.3 Torr.

(Multiple Choice)

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Question 100

Showing 81 - 100 of 153

Exam 12: Solutions

Calculate the vapour pressure of pure water at 65 °C if a 465 mL solution containing 123.0 g of ribose,C5H10O5,has a vapour pressure of 247.54 mbar.Assume no change in volume occurs upon dissolution.

What is the freezing point of a solution of 7.15 g MgCl2 in 100 g of water? Kf for water is 1.86∘Cm−11.86 ^ { \circ } \mathrm { Cm } ^ { - 1 }1.86∘Cm−1

A mixture of pentane and hexane has a vapour pressure of 241 Torr.Calculate the mole fraction of pentane in the mixture.The vapour pressures of pure pentane and hexane are 425 Torr and 151 Torr,respectively.Assume ideal behaviour.

A solution is formed at room temperature by vigorously dissolving enough of the solid solute so that some solid remains at the bottom of the solution.Which statement below is TRUE?

The boiling point of an aqueous 1.83 mol kg-1 (NH4)2SO4 (molar mass = 132.15 g mol-1)solution is 102.5 °C.Determine the value of the van't Hoff factor for this solute if the Kb for water is 0.512 °C m-1.

How many grams of KBr are required to make 350.mL of a 0.115 mol L-1 KBr solution?

A solution containing less solute than the equilibrium amount is called

Parts per billion requires a multiplication factor of ________.

Calculate the total solution volume required to produce an osmotic pressure of 6.39 mbar using 12.34 mg of a protein with a molar mass of 5309 g mol-1 at 25.0 °C.

What mass of NaCl is contained in 24.88 g of a 15.00% by mass solution of NaCl in water?

Determine the molality of an aqueous solution prepared by dissolving 0.112 moles of LiCl in 13.7 moles of H2O.

Give the preparation of rock candy.

Solutions having osmotic pressures less than those of body fluids are called ________.

A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution.Calculate the mass % of the solution if the density of the solution is 1.06 g mL-1.

Determine ΔsoluteH for KBr if the ΔsolutionH for KBr is +19.9 kJ mol-1 and the ΔhydrationH for KBr is -670.kJ mol-1.

Calculate the volume of solution that has a vapour pressure of 31.27 mbar and contains 84.3 g of sucrose,C12H22O11,at a temperature of 25.0 °C.The vapour pressure of pure water at 25 °C is 31.7 mbar,the density of water is 1.00 g mL-1,and assume no change in volume occurs upon dissolution.

Which of the following compounds will be most soluble in ethanol (CH3CH2OH)?

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C8H10N4O2,in 75 g of benzene,C6H6?

Determine the vapour pressure of a solution at 28 °C that contains 62.5 g of fructose (C6H12O6)in 325.0 mL of water.The vapour pressure of pure water at 28 °C is 28.3 Torr.

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Calculate the vapour pressure of pure water at 65 °C if a 465 mL solution containing 123.0 g of ribose,C₅H₁₀O₅,has a vapour pressure of 247.54 mbar.Assume no change in volume occurs upon dissolution.

What is the freezing point of a solution of 7.15 g MgCl₂ in 100 g of water? K_f for water is $1.86 ^ { \circ } \mathrm { Cm } ^ { - 1 }$

The boiling point of an aqueous 1.83 mol kg^-1 (NH₄)₂SO₄ (molar mass = 132.15 g mol^-1)solution is 102.5 °C.Determine the value of the van't Hoff factor for this solute if the K_b for water is 0.512 °C m^-1.

How many grams of KBr are required to make 350.mL of a 0.115 mol L^-1 KBr solution?

Calculate the total solution volume required to produce an osmotic pressure of 6.39 mbar using 12.34 mg of a protein with a molar mass of 5309 g mol^-1 at 25.0 °C.

Determine the molality of an aqueous solution prepared by dissolving 0.112 moles of LiCl in 13.7 moles of H₂O.

A solution is prepared by dissolving 98.6 g of NaCl in enough water to form 875 mL of solution.Calculate the mass % of the solution if the density of the solution is 1.06 g mL^-1.

Determine Δ_soluteH for KBr if the Δ_solutionHfor KBr is +19.9 kJ mol^-1 and the Δ_hydrationH for KBr is -670.kJ mol^-1.

Which of the following compounds will be most soluble in ethanol (CH₃CH₂OH)?

What is the weight percent of a caffeine solution made by dissolving 8.35 g of caffeine,C₈H₁₀N₄O₂,in 75 g of benzene,C₆H₆?

Determine the vapour pressure of a solution at 28 °C that contains 62.5 g of fructose (C₆H₁₂O₆)in 325.0 mL of water.The vapour pressure of pure water at 28 °C is 28.3 Torr.