Concentration Units and Conversions Quiz

Which unit of concentration is particularly useful for colligative properties?

• Mass Percent

• Mole Fraction

• Molality

• Molarity

What does molarity measure in a solution?

• Moles of solute per mole of solvent

• Mass of solute per mass of solution

• Moles of solute per liter of solution

• Moles of solute per kilogram of solvent

How is the mole fraction of a solute calculated?

• Moles of solute divided by total moles of solute and solvent

• Moles of solute divided by kilograms of solvent

• Moles of solute divided by total liters of solution

• Mass of solute divided by total mass of solution

What is the key difference between molarity and molality?

• Molarity uses mass of solvent, molality uses volume of solution

• Molality is temperature-dependent, molarity is not

• Molality uses mass of solvent, molarity uses volume of solution

• Molarity is temperature-dependent, molality is not

How is mass percent related to parts per million?

• Mass percent is parts per million times 10,000

• Mass percent is parts per million divided by 100

• Mass percent is parts per million times 100

• Mass percent is parts per million divided by 10,000

In the example, what sample size is chosen to simplify calculations?

• 200 grams

• 100 grams

• 500 grams

• 50 grams

What is the molarity of the 20% H2SO4 solution calculated in the example?

• 2.33 M

• 4.33 M

• 3.33 M

• 1.33 M

What is the molality of the 20% H2SO4 solution calculated in the example?

• 1.55 molal

• 2.55 molal

• 3.55 molal

• 4.55 molal

How is the mole fraction of H2SO4 calculated in the example?

• 0.065

• 0.055

• 0.045

• 0.075

What is the significance of intensive properties in concentration calculations?

• They are always pressure-dependent

• They are always temperature-dependent

• They do not depend on the sample size

• They depend on the sample size