8 ppm) of sea water The
concentration of pollutants in water or atmosphere is often expressed
in terms of mg mL
–1 or ppm (v) Mole fraction: Commonly used symbol for mole fraction is x and
subscript used on the right hand side of x denotes the component It is defined as:
Mole fraction of a component =
Number of moles of the component
Total number of moles of all the components
(1