Further Calculations (Leaving Cert Chemistry): Flashcards

Proportion of each element in a compound

$\frac{\text{element mass}}{\text{molecular mass}} \times 100$

Percentages should add up to 100%

Simplest whole number ratio of atoms in a compound

Actual number of atoms in a compound

Molecular: $C_6H_6$; Empirical: $CH$

Convert percentages to masses (assume 100g)

Calculate moles by dividing mass by atomic mass

Divide all mole values by smallest number of moles

Using mass measurements to determine empirical formulae

22.4 litres

Mole ratios between reactants and products

Write the balanced equation

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