Mole Fractions

The sum of all mole fractions equal

• a. 1

• b. 0.1

• c. 001

• d. 2

It is the number of molecules (or moles) of one component divided by total the number of molecules (or moles) in the mixture

• a. molality

• b. molarity

• c. normality

• d. mole fraction

The sum of all mole fractions in a mixture is equal to

• a. 1

• b. 0.1

• c. 0.01

• d. 2

It is the number of molecules (or moles) of one component divided by the total number of molecules (or moles) in the mixture

• a. molality

• b. molarity

• c. normality

• d. mole fraction

Which of the following is a correct expression for mole fraction?

In a binary mixture, if the mole fraction of component A is 0.3, what is the mole fraction of component B?

• a. 0.3

• b. 0.7

• c. 1.0

• d. 0.5

Mole fraction is a dimensionless quantity. True or False?

• a. True

• b. False

Which of the following statements is true about mole fractions?

• a. Mole fractions are always greater than 1

• b. Mole fractions are always less than 1

• c. Mole fractions can be negative

• d. Mole fractions are always equal to 1

If the mole fraction of nitrogen in a mixture is 0.25, what is the mole fraction of the other components combined?

• a. 0.25

• b. 0.50

• c. 0.75

• d. 1.00

Mole fraction is used in which of the following calculations?

• a. Calculating molarity

• b. Calculating partial pressure

• c. Calculating density

• d. Calculating volume