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Chemistry vocabulary · Moles and Stoichiometry

Stoichiometry

Meaning in chemistry, with examples

/ˌstɔɪkiˈɒmətri/nounCommon term

In chemistry, stoichiometry means: The calculation of the amounts of reactants and products in a reaction, using the mole ratios from the balanced equation.

In Turkish: stokiyometri

How it is used

A core topic in general chemistry and a daily tool in synthesis. You solve stoichiometry problems and say reagents are used 'in stoichiometric amounts' or 'in excess'. In procedures, chemists write 'equiv' for equivalents.

Example sentences

  1. The stoichiometry tells us we need two moles of hydrogen for every mole of oxygen.

  2. Check the stoichiometry before you scale up the reaction.

Common collocations

  • reaction stoichiometry
  • stoichiometric amount
  • stoichiometry problem
  • mole ratio
  • 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.
  • balanced equationA chemical equation with the same number of atoms of each element on both sides and the same total charge, so that mass is conserved.
  • limiting reagentThe reactant that runs out first in a reaction. It decides the maximum amount of product that can form; the other reactants are left over in excess.
  • percent yieldThe amount of product actually obtained, divided by the maximum possible (theoretical) amount and multiplied by 100. It shows how efficient a reaction was.
  • molar massThe mass of one mole of a substance, usually given in grams per mole (g/mol). For water it is about 18.02 g/mol.

More terms: Moles and Stoichiometry

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