Formulas
Relative Formula Mass (Mr):
- Find mass number of each element in the equation
- Multiply the mass number by the little number next to the element
- Add them
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Empirical Formula:
Smallest whole number ratio of atoms in a compound.
- Divide the little numbers by the HCF e.g:
C6H12O6
Divide all by 6 and it becomes CH2O
| Element | ///////////////1/////////////// | /////////////////2///////////// |
|---|---|---|
| Mass | ||
| Mr | ||
| Moles | ||
| Ratio |
- Moles = mass/Mr
- To work out ratio, divide both of the moles by the smallest mole out of the set
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Balancing Equations using Masses:
- Find moles
- However many moles you have is the number you put in front of the element/compound to balance the equation
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