[Chemistry] Mole

INTRODUCTION

A mole of a substance is the amount that contains the same number of units (atoms, molecules or ions) as the number of carbon atoms in 12 grams of Carbon-12.

BACKGROUND

  • We know that atom is an extremely small particle.
  • The mass of an individual atom is a very small quantity and is not feasible for calculation.
  • It is impossible to weight individual atoms or even small groups of atoms directly.
  • Therefore, the concept of mole is used. One mole of a substance is the relative atomic/molecular mass expressed in grams.
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