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CAIE IGCSE Chemistry 3.3.3 Amount of substance relation: amount

CAIE IGCSE Chemistry 3.3.3 Amount of substance relation: amount
Cambridge IGCSE Chemistry 0620 syllabus for exams in 2026, 2027 and 20282026–2028

Practise using moles, molar mass and Avogadro constant to convert between mass, amount and particle numbers in chemical samples.

How this is tested

  • calculate amount from mass and molar mass, then convert to atoms, ions or molecules
  • determine water of crystallisation by comparing moles of salt and H2O

Question 12

[Maximum number: 1]

Magnesium chloride, MgCl2\mathrm{MgCl}_{2}, contains magnesium ions and chloride ions.
How many chloride ions are present in two moles of magnesium chloride?

A

6.02×10236.02 \times 10^{23}

B

1.204×10241.204 \times 10^{24}

C

2.408×10242.408 \times 10^{24}

D

3.612×10243.612 \times 10^{24}