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AP EAMCET202022 Sep 2020Evening ShiftChemistrySome Basic Concepts of ChemistryActual

Which among the following is a unitless physical quantity?

Options

  1. AMolality
  2. BMolarity
  3. CMole fraction
  4. DNormality

Correct answer

C. Mole fraction

Step-by-step 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).

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