Which among the following is a unitless physical quantity?

Which among the following is a unitless physical quantity?
  1. Molality
  2. Molarity
  3. Mole fraction
  4. Normality

Solution

Mole fraction is a unit of concentration, defined to be equal to the number of moles of a component divided by the total number of moles of a solution. Because it is a ratio, mole fraction is a unitless expression. The mole fraction of all components of a solution, when added together, will equal 1 . Hence, the correct option is (3).

Asked in: AP EAMCET 2020 (22 Sep Shift 2)

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