1 u = Ma/NA.

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Class 11 Chemistry Practice Test: Basic Concepts of Chemistry - Mole Concept and Molar Masses — practice the complete quiz, review flashcards, or try a random question.

Molar mass of a substance is the mass in grams of one mole of the compound. In a substance, the amount of entities present e.g. atoms, molecules, ions, is defined as a mole. A mole of any substance is 6.022×10^23 molecules.

The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant. The concept of the mole can be used to convert between mass and number of particles.


1 u = M<sub>a</sub>/N<sub>A</sub>.