Mole Fraction Chemistry

Who first proposed the idea of the mole?

• Lorenzo Romano Amedeo Carlo Avogadro

• Albert Einstein

• Isaac Newton

• Marie Curie

What is the purpose of using the mole in chemistry?

• To count extremely small particles

• To measure weight

• To buy groceries

• To study animals

How do chemists use the mole?

• To count particles in a sample

• To measure temperature

• To calculate volume

• To buy groceries

Tags

NGSS.HS-PS1-7

What is the mole fraction of a component in a solution?

• The ratio of the moles of the component to the total moles of all components

• The ratio of the mass of the component to the total mass of the solution

• The ratio of the volume of the component to the total volume of the solution

• The ratio of the density of the component to the total density of the solution

In a binary solution, if the mole fraction of solute is 0.2, what is the mole fraction of solvent?

• 0.8

• 0.2

• 0.5

• 1.0

Which of the following is true about mole fraction?

• It is dimensionless

• It has units of moles per liter

• It is always greater than 1

• It is expressed in percentage

How does temperature affect the mole fraction of a component in a solution?

• Temperature does not affect mole fraction

• Mole fraction increases with temperature

• Mole fraction decreases with temperature

• Mole fraction becomes zero at high temperature

If a solution is made by dissolving 2 moles of NaCl in 8 moles of water, what is the mole fraction of NaCl?

• 0.2

• 0.8

• 0.25

• 0.1

What is the sum of mole fractions of all components in a solution?

• 1

• 0

• Depends on the solution

• Infinity

Which of the following expressions represents the mole fraction of component A in a mixture?