Edexcel IGCSE Chemistry · Spec 1.31, 1.33
Empirical and Molecular Formulae from Data
Covers find empirical formulae from experimental masses, Use water-of-crystallisation data and Find molecular formulae from Mr.
Chemistry revision video
Empirical and Molecular Formulae from Data
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Spec 1.31, 1.33
What you need to know
- Find empirical formulae from experimental masses
- Use water-of-crystallisation data
- Find molecular formulae from Mr
Active recall
Quick check
Answer each question before opening the answer.
Why heat to constant mass?
To check that all removable water has been driven off
How is water mass found?
Initial hydrated mass minus final anhydrous mass
What is the molecular formula if the empirical formula is NO2 and Mr is 92?
N2O4
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