BRAINCAKEPercentage Composition by Mass
Sometimes it is useful to know the percentage composition by mass of an element in a compound.
For example nitrogen is needed for plant growth and is added to the soil in fertilisers.
One of the main fertilisers used is ammonium nitrate NH4NO3.
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Key terms in this lesson
- relative atomic mass
- The weighted mean mass of one atom of an element compared with 1/12 of the mass of one atom of carbon-12.
- relative molecular mass
- The sum of the relative atomic masses of the atoms in a molecule's formula, compared with 1/12 the mass of carbon-12.
More in Amount of Substance and Calculations
- Ionic Equations - Question 4
- Calculations of Reacting Masses
- Working out Equations from Reacting Masses
- Empirical Formula
- Combustion Analysis
- Molecular Formula
- Example Question - 1
- Example Question - 2
All 39 lessons in Amount of Substance and Calculations · All Edexcel AS-level Chemistry topics