What is the freezing point of a solution that contains 20.0 g of glucose (C6H12O6)in 100.0 g of H2O? Kf for water is 1.86°C/m.

A) -0.206°C B) -2.06°C C) -1.86°C D) +0.111°C E) +1.11°C A) -0.206°C B) -2.06°C C) -1.86°C D) +0.111°C E) +1.11°C

Consider a 0.900 M Al(NO3)3 solution. This solution has a nitrate ion concentration of

A) 0.300 M. B) 0.900 M. C) 2.70 M. D) 3.60 M. E) 8.10 M. A) 0.300 M. B) 0.900 M. C) 2.70 M. D) 3.60 M. E) 8.10 M.

At 28.0°C, the vapor pressure of n-propyl mercaptan, C3H7SH, is 175 torr, while that ofacetonitrile, CH3CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made bymixing 80.0 g of C3H7SH and 120.0 g CH3CN, if Raoult's Law is obeyed?Hint: Organizing the given information into moles and mole fraction of each component will help in solving this problem.

A) 121 torr B) 131 torr C) 139 torr D) 146 torr E) 156 torr A) 121 torr B) 131 torr C) 139 torr D) 146 torr E) 156 torr

Exam 13: Mixtures at the Molecular Level: Properties of Solutions

What is the mass percent of CdSO₄ in a 2.00 molal aqueous CdSO₄ solution? Assume that exactly 1 ml water = 1 g water at this temperature. Do these numbers 1 mL and 1 g only have 1 significant figure?

(Short Answer)

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Question 121

An aqueous solution is prepared by mixing 0.2750 moles of NaOH (40.00 g mol^-1)with 189.0 g of water. Its density is 1.065 g mL^-1. What is the percent by weight of NaOH in the solution?

(Multiple Choice)

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Question 122

What is the freezing point of a solution that contains 20.0 g of glucose (C₆H₁₂O₆)in 100.0 g of H₂O? K_f for water is 1.86°C/m.

(Multiple Choice)

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Question 123

Consider a 0.900 M Al(NO₃)₃ solution. This solution has a nitrate ion concentration of

(Multiple Choice)

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Question 124

A chemist isolates a new compound with an empirical formula C₃H₃O₂. 3.52 g of the unknown compound was dissolved in 100.0 g of water. The resulting solution had a freezing point of -0.307°C. What is the molecular formula for the unknown compound?For water, K_f = 1.86°C m⁻¹.Hint: Use the freezing point depression to find the molar mass of the compound, then find the molecular formula as in Chapter 3.

(Short Answer)

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Question 125

How many moles of the nonelectrolyte, propylene glycol (C₃H₈O₂)should be dissolved in 800.0 g of water to prepare a solution whose freezing point is -3.72°C?For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

(Multiple Choice)

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Question 126

Substances that have both a hydrophobic end and a hydrophilic end to their molecular structure can form a spherical structure called a ________.

(Short Answer)

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Question 127

Describe what a colligative property is. Explain Raoult's Law in terms of colligative properties.

(Short Answer)

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Question 128

How many liters of ethylene glycol antifreeze (C₂H₆O₂), with a density of 1.100 g/mL, would you add to your car radiator containing 15.0 kg of water if you needed to protect your engine to -21.5°C? For water, K_f = 1.86°C m⁻¹.Hint: Find molality, moles, grams of solute, milliliters, then liters, making sure to pay attention to units.

(Short Answer)

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Question 129

At 28.0^°C, the vapor pressure of n-propyl mercaptan, C₃H₇SH, is 175 torr, while that ofacetonitrile, CH₃CN, is 102 torr. What is the vapor pressure, at 28.0°C, of a solution made bymixing 80.0 g of C₃H₇SH and 120.0 g CH₃CN, if Raoult's Law is obeyed?Hint: Organizing the given information into moles and mole fraction of each component will help in solving this problem.

(Multiple Choice)

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Question 130

A solution in a beaker has some un-dissolved solute lying on the bottom of the beaker. If the rate of crystallization is equal to the rate of dissolution of the excess solute, the solution is described as

(Multiple Choice)

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Question 131

Pure benzene, C₆H₆, has a freezing point of 5.45°C. Its freezing point depressionconstant is: K_f = 5.07 °C m^-1. A solution was made by taking 10.00 g of an unknown nonelectrolyte and dissolving it in 105.0 g of benzene. The measured freezing point of the solution was -1.05°C. Calculate the molecular weight of the unknown substance.Hint: Find molality, then moles, then molar mass, being sure to keep track of units.

(Multiple Choice)

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Question 132

Which aqueous solution will have the lowest freezing point temperature?

(Multiple Choice)

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Question 133

Showing 121 - 133 of 133

What is the mass percent of CdSO₄ in a 2.00 molal aqueous CdSO₄ solution? Assume that exactly 1 ml water = 1 g water at this temperature. Do these numbers 1 mL and 1 g only have 1 significant figure?

An aqueous solution is prepared by mixing 0.2750 moles of NaOH (40.00 g mol^-1)with 189.0 g of water. Its density is 1.065 g mL^-1. What is the percent by weight of NaOH in the solution?

What is the freezing point of a solution that contains 20.0 g of glucose (C₆H₁₂O₆)in 100.0 g of H₂O? K_f for water is 1.86°C/m.

Consider a 0.900 M Al(NO₃)₃ solution. This solution has a nitrate ion concentration of

How many moles of the nonelectrolyte, propylene glycol (C₃H₈O₂)should be dissolved in 800.0 g of water to prepare a solution whose freezing point is -3.72°C?For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.

Substances that have both a hydrophobic end and a hydrophilic end to their molecular structure can form a spherical structure called a ________.

Describe what a colligative property is. Explain Raoult's Law in terms of colligative properties.

A solution in a beaker has some un-dissolved solute lying on the bottom of the beaker. If the rate of crystallization is equal to the rate of dissolution of the excess solute, the solution is described as

Which aqueous solution will have the lowest freezing point temperature?

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

Exam 13: Mixtures at the Molecular Level: Properties of Solutions

What is the mass percent of CdSO4 in a 2.00 molal aqueous CdSO4 solution? Assume that exactly 1 ml water = 1 g water at this temperature. Do these numbers 1 mL and 1 g only have 1 significant figure?

An aqueous solution is prepared by mixing 0.2750 moles of NaOH (40.00 g mol-1)with 189.0 g of water. Its density is 1.065 g mL-1. What is the percent by weight of NaOH in the solution?

What is the freezing point of a solution that contains 20.0 g of glucose (C6H12O6)in 100.0 g of H2O? Kf for water is 1.86°C/m.

Consider a 0.900 M Al(NO3)3 solution. This solution has a nitrate ion concentration of

How many moles of the nonelectrolyte, propylene glycol (C3H8O2)should be dissolved in 800.0 g of water to prepare a solution whose freezing point is -3.72°C?For water, Kf is 1.86°C m-1 and Kb is 0.512°C m-1.

Substances that have both a hydrophobic end and a hydrophilic end to their molecular structure can form a spherical structure called a ________.

Describe what a colligative property is. Explain Raoult's Law in terms of colligative properties.

A solution in a beaker has some un-dissolved solute lying on the bottom of the beaker. If the rate of crystallization is equal to the rate of dissolution of the excess solute, the solution is described as

Which aqueous solution will have the lowest freezing point temperature?

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

What is the mass percent of CdSO₄ in a 2.00 molal aqueous CdSO₄ solution? Assume that exactly 1 ml water = 1 g water at this temperature. Do these numbers 1 mL and 1 g only have 1 significant figure?

An aqueous solution is prepared by mixing 0.2750 moles of NaOH (40.00 g mol^-1)with 189.0 g of water. Its density is 1.065 g mL^-1. What is the percent by weight of NaOH in the solution?

What is the freezing point of a solution that contains 20.0 g of glucose (C₆H₁₂O₆)in 100.0 g of H₂O? K_f for water is 1.86°C/m.

Consider a 0.900 M Al(NO₃)₃ solution. This solution has a nitrate ion concentration of

How many moles of the nonelectrolyte, propylene glycol (C₃H₈O₂)should be dissolved in 800.0 g of water to prepare a solution whose freezing point is -3.72°C?For water, K_f is 1.86°C m^-1 and K_b is 0.512°C m^-1.