Question 1

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL-1.

Accepted Answer

A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.31% 
A)  10.4% 
B)  8.57% 
C)  10.1% 
D)  11.7% 
E)  9.31%

Question 2

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L-1 C2H6O2 II. 0.15 mol L-1 MgCl2 III. 0.15 mol L-1 NaCl

Accepted Answer

A)  III < I < II 
B)  II < III < I 
C)  I < II < III 
D)  II < I < III 
E)  I < III < II 
A)  III < I < II 
B)  II < III < I 
C)  I < II < III 
D)  II < I < III 
E)  I < III < II

Question 3

Calculate the mass of maltose, C12H22O11, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

Accepted Answer

A)  482 g 
B)  329 g 
C)  265 g 
D)  163 g 
E)  94.1 g 
A)  482 g 
B)  329 g 
C)  265 g 
D)  163 g 
E)  94.1 g

Question 4

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

Accepted Answer

A)  622 
B)  1.27 × 103 
C)  1.61 × 10-3 
D)  0.622 
E)  1.61 
A)  622 
B)  1.27 × 103 
C)  1.61 × 10-3 
D)  0.622 
E)  1.61

Question 5

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

Accepted Answer

A)  0. 176 
B)  0. 213 
C)  0. 352 
D)  0. 545 
A)  0. 176 
B)  0. 213 
C)  0. 352 
D)  0. 545

Question 6

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

Accepted Answer

A)  0.153 bar 
B)  0.127 bar 
C)  0.0967 bar 
D)  0.108 bar 
E)  0.0907 bar 
A)  0.153 bar 
B)  0.127 bar 
C)  0.0967 bar 
D)  0.108 bar 
E)  0.0907 bar

Question 7

A compound is found to have a molar mass of 598 g mol-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Accepted Answer

A)  3.42 × 10-3 bar 
B)  8.48 × 10-3 bar 
C)  5.01 × 10-3 bar 
D)  5.99 × 10-3 bar 
E)  8.06 × 10-3 bar 
A)  3.42 × 10-3 bar 
B)  8.48 × 10-3 bar 
C)  5.01 × 10-3 bar 
D)  5.99 × 10-3 bar 
E)  8.06 × 10-3 bar

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL^-1.

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L^-1 C₂H₆O₂ II. 0.15 mol L^-1 MgCl₂ III. 0.15 mol L^-1 NaCl

Calculate the mass of maltose, C₁₂H₂₂O₁₁, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C₂H₅OH, in 53.6 g of water?

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

A compound is found to have a molar mass of 598 g mol^-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

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Exam 12: Solutions

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL-1.

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L-1 C2H6O2 II. 0.15 mol L-1 MgCl2 III. 0.15 mol L-1 NaCl

Calculate the mass of maltose, C12H22O11, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

A solution is prepared by adding 1.43 mol of KCl to 889 g of water. The concentration of KCl is ________ molal.

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C2H5OH, in 53.6 g of water?

Determine the vapour pressure of a solution at 55 °C that contains 34.2 g NaCl in 375 mL of water. The vapour pressure of pure water at 55 °C is 0.1574 bar.

A compound is found to have a molar mass of 598 g mol-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry Ii: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

A solution is prepared by dissolving 49.3 g of KBr in enough water to form 473 mL of solution. Calculate the mass % of KBr in the solution if the density is 1.12 g mL^-1.

Place the following solutions in order of increasing osmotic pressure. I. 0.15 mol L^-1 C₂H₆O₂ II. 0.15 mol L^-1 MgCl₂ III. 0.15 mol L^-1 NaCl

Calculate the mass of maltose, C₁₂H₂₂O₁₁, contained in 725.0 mL of solution if the measured vapour pressure of the solution is 41.6 mbar at 30 °C. The vapour pressure of pure water at 30 °C is 42.40 mbar; assume no change in volume occurs upon dissolution.

What is the mole fraction of ethanol in a solution made by dissolving 29.2 g of ethanol, C₂H₅OH, in 53.6 g of water?

A compound is found to have a molar mass of 598 g mol^-1. If 35.8 mg of the compound is dissolved in enough water to make 175 mL of solution at 25 °C, what is the osmotic pressure of the resulting solution?