Question 1

How many molecules of sucrose (table sugar),C12H22O11,dissolved in 450.0 g of water are needed to make a 1.81 m solution?

Accepted Answer

A) 4.90 $\times$ 1023 molecules 
B) 8.15 $\times$ 1023 molecules 
C) 2.42 $\times$ 1024 molecules 
D) 2.72 $\times$ 1025 molecules 
E) 1.50 $\times$ 1023 molecules 
A) 4.90 $\times$ 1023 molecules 
B) 8.15 $\times$ 1023 molecules 
C) 2.42 $\times$ 1024 molecules 
D) 2.72 $\times$ 1025 molecules 
E) 1.50 $\times$ 1023 molecules

Question 2

The osmotic pressure of a 0.0100 M solution of NaCl in water at 25°C is found to be different from 372 torr because:

Accepted Answer

A) Osmotic pressures are hard to measure. 
B) Na+ and Cl- ions are strongly hydrated. 
C) Na+ and Cl- ions can form ion pairs. 
D) NaCl does not dissociate in water. 
E) None of these. 
A) Osmotic pressures are hard to measure. 
B) Na+ and Cl- ions are strongly hydrated. 
C) Na+ and Cl- ions can form ion pairs. 
D) NaCl does not dissociate in water. 
E) None of these.

Question 3

Find the mass percent of CuSO4 in a solution whose density is 1.30 g/mL and whose molarity is 1.36 M.

Accepted Answer

A) 83.3% 
B) 1.77% 
C) 16.7% 
D) 2.66% 
E) none of these 
A) 83.3% 
B) 1.77% 
C) 16.7% 
D) 2.66% 
E) none of these

Question 4

In osmosis:

Accepted Answer

A) Knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent. 
B) The semipermeable membrane is used to change the freezing and melting points of a solution. 
C) Solutions cannot have identical osmotic pressures. 
D) Temperature does not affect the osmotic pressure of a solution. 
E) At least two of the above statements are correct. 
A) Knowing the osmotic pressure can help determine the molar mass of a solute dissolved in a solvent. 
B) The semipermeable membrane is used to change the freezing and melting points of a solution. 
C) Solutions cannot have identical osmotic pressures. 
D) Temperature does not affect the osmotic pressure of a solution. 
E) At least two of the above statements are correct.

Question 5

For each of the following solutions,describe the deviation with respect to Raoult's Law.
-acetone (C3H6O)and water

Accepted Answer

A) relatively ideal 
B) positive deviation 
C) negative deviation 
D) more information needed 
E) none of these 
A) relatively ideal 
B) positive deviation 
C) negative deviation 
D) more information needed 
E) none of these

Question 6

The vapor pressure of water at 25.0°C is 23.8 torr.Determine the mass of glucose (molar mass = 180 g/mol)needed to add to 500.0 g of water to change the vapor pressure to 22.8 torr.

Accepted Answer

A) 21.9 g 
B) 219 g 
C) 180 g 
D) 6.21 kg 
E) 188 g 
A) 21.9 g 
B) 219 g 
C) 180 g 
D) 6.21 kg 
E) 188 g

Question 7

Use the following drawing of a gaseous solute in equilibrium with a solution to help answer the question below.   Which of the following statements are true when the piston is pushed in (downward)?

Accepted Answer

A) This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go down. 
B) This will cause the pressure of the gas to decrease and the concentration of the dissolved gas to go down. 
C) This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go up. 
D) This will cause the volume of the gas to decrease and the concentration of the dissolved gas to go down. 
E) This will cause the volume of the gas to increase and the concentration of the dissolved gas to go up. 
A) This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go down. 
B) This will cause the pressure of the gas to decrease and the concentration of the dissolved gas to go down. 
C) This will cause the pressure of the gas to increase and the concentration of the dissolved gas to go up. 
D) This will cause the volume of the gas to decrease and the concentration of the dissolved gas to go down. 
E) This will cause the volume of the gas to increase and the concentration of the dissolved gas to go up.

Question 8

Which of the following chemical or physical changes is an endothermic process?

Accepted Answer

A) the evaporation of water 
B) the combustion of gasoline 
C) the mixing of sulfuric acid and water 
D) the freezing of water 
E) none of these 
A) the evaporation of water 
B) the combustion of gasoline 
C) the mixing of sulfuric acid and water 
D) the freezing of water 
E) none of these

How many molecules of sucrose (table sugar),C₁₂H₂₂O₁₁,dissolved in 450.0 g of water are needed to make a 1.81 m solution?

The osmotic pressure of a 0.0100 M solution of NaCl in water at 25°C is found to be different from 372 torr because:

Find the mass percent of CuSO₄ in a solution whose density is 1.30 g/mL and whose molarity is 1.36 M.

In osmosis:

For each of the following solutions,describe the deviation with respect to Raoult's Law. -acetone (C₃H₆O)and water

The vapor pressure of water at 25.0°C is 23.8 torr.Determine the mass of glucose (molar mass = 180 g/mol)needed to add to 500.0 g of water to change the vapor pressure to 22.8 torr.

Use the following drawing of a gaseous solute in equilibrium with a solution to help answer the question below. Which of the following statements are true when the piston is pushed in (downward)?

Which of the following chemical or physical changes is an endothermic process?

Chemical Foundations

Atoms, molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Thermochemistry

Atomic Structure and Periodicity

Bonding: General Concepts

Covalent Bonding: Orbitals

Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex Ion Equilibria

Spontaneity, entropy, and Free Energy

Electrochemistry

The Nucleus: a Chemists View

The Representative Elements

Transition Metals and Coordination Chemistry

Organic and Biological Molecules

Filters

Exam 11: Properties of Solutions

How many molecules of sucrose (table sugar),C12H22O11,dissolved in 450.0 g of water are needed to make a 1.81 m solution?

The osmotic pressure of a 0.0100 M solution of NaCl in water at 25°C is found to be different from 372 torr because:

Find the mass percent of CuSO4 in a solution whose density is 1.30 g/mL and whose molarity is 1.36 M.

In osmosis:

For each of the following solutions,describe the deviation with respect to Raoult's Law. -acetone (C3H6O)and water

The vapor pressure of water at 25.0°C is 23.8 torr.Determine the mass of glucose (molar mass = 180 g/mol)needed to add to 500.0 g of water to change the vapor pressure to 22.8 torr.

Use the following drawing of a gaseous solute in equilibrium with a solution to help answer the question below. Which of the following statements are true when the piston is pushed in (downward)?

Which of the following chemical or physical changes is an endothermic process?

Chemical Foundations

Atoms, molecules, and Ions

Stoichiometry

Chemical Reactions and Solutions Stoichiometry

Gases

Thermochemistry

Atomic Structure and Periodicity

Bonding: General Concepts

Covalent Bonding: Orbitals

Liquids and Solids

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria

Solubility and Complex Ion Equilibria

Spontaneity, entropy, and Free Energy

Electrochemistry

The Nucleus: a Chemists View

The Representative Elements

Transition Metals and Coordination Chemistry

Organic and Biological Molecules

Filters

How many molecules of sucrose (table sugar),C₁₂H₂₂O₁₁,dissolved in 450.0 g of water are needed to make a 1.81 m solution?

Find the mass percent of CuSO₄ in a solution whose density is 1.30 g/mL and whose molarity is 1.36 M.

For each of the following solutions,describe the deviation with respect to Raoult's Law. -acetone (C₃H₆O)and water