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mass

& stoichiometry

'no magic to the mole'

amount

molar mass

concentration

solution volume

gas volume

molar gas volume

Avogadro
constant, L

number of
entities, N

amount of substance

Now try the following question.

G6. CALCULATING THE NUMBER OF IONS IN A PURE IONIC SAMPLE - 2

The calculations dealt with in Q7. are now extended to two-step problems as the chemical
quantities are provided as masses rather than chemical amounts.

establishing entities

no. of entities & mass

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