Units of Concentration

Question 1

Molarity (M)

Answer 1

mol solute/vol solution (mol/L)

Question 2

Molality (m)

Answer 2

mol solute/mass solvent (mol/kg)

Question 3

Mole fraction (X)

Answer 3

mol solute/total mol solute and solvent

Question 4

Mole percent (mol %)

Answer 4

mol solute/mol solute and solvent * 100%

Question 5

Parts by mass

Answer 5

mass solute/mass solution * factor
percent = 100
ppm = 10^6
ppb = 10^9

Question 6

Parts by volume

Answer 6

volume solute/volume solution * factor