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Moles, mass and rearranging equations in chemistry

Quantitative chemistry • Amount of substance and mass

Key concepts

What you'll likely be quizzed about

  • A mole represents a fixed number of particles, equal to 6.02 × 10^23 entities, known as the Avogadro constant.
  • This unit links microscopic particle counts to macroscopic amounts, enabling calculations involving quantities of substances.

Flashcards

Test your knowledge with interactive flashcards

Rearrange n = m ÷ Mr to make m the subject.

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m = n × Mr (mass equals number of moles times relative formula mass).

Key notes

Important points to keep in mind

Use n = m ÷ Mr to find number of moles; include units (mol).

Use m = n × Mr to find mass; ensure proper values for Mr.

Mr equals the sum of the Ar values; check subscripts carefully.

Apply the same operation to both sides when changing the subject of an equation.

Maintain consistent units: mass in grams, Mr in g mol^-1, amount in mol.

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