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Chemistry vocabulary · Moles and Stoichiometry

Molar mass

Meaning in chemistry, with examples

nounCore term

In chemistry, molar mass means: The mass of one mole of a substance, usually given in grams per mole (g/mol). For water it is about 18.02 g/mol.

In Turkish: mol kütlesi, molar kütle

How it is used

Used in almost every lab calculation to switch between grams and moles. You calculate, look up or check the molar mass; bottle labels and older texts often give the same number as 'molecular weight' (MW) or 'formula weight' (FW).

Example sentences

  1. The molar mass of sodium chloride is 58.44 g/mol, so 5.844 g is 0.1 mol.

  2. Use the molar mass on the bottle label, not a rounded value.

Common collocations

  • calculate the molar mass
  • molar mass of
  • grams per mole
  • look up the molar mass
  • moleThe SI unit for amount of substance. One of these units contains about 6.022 × 10²³ particles, which lets chemists count atoms and molecules by weighing them.
  • Avogadro's numberThe number of particles in one mole of a substance, about 6.022 × 10²³. Strictly speaking, the Avogadro constant has the unit per mole (mol⁻¹).
  • stoichiometryThe calculation of the amounts of reactants and products in a reaction, using the mole ratios from the balanced equation.
  • empirical formulaThe simplest whole-number ratio of the atoms of each element in a compound. Glucose is C₆H₁₂O₆, but its simplest ratio is CH₂O.

More terms: Moles and Stoichiometry

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