Study notes
Chemical Calculations (Mole Concept)
Chemical formulae and balanced equations, relative atomic and molecular mass, the mole, and calculations involving mass, gas volume, concentration, percentage yield and purity.
What this topic covers
- Chemical formulae are deduced from ratios or ionic charges
- A balanced equation has the same number of each atom on both sides
- Relative atomic mass and relative molecular/formula mass
- The mole links particle count to mass
- Gas volume at room temperature and pressure (r.t.p.)
- Percentage mass of an element in a compound
- Empirical formula is the simplest whole-number mole ratio
- Molecular formula is a whole-number multiple of the empirical formula
- The mole ratio from a balanced equation drives reacting-mass and reacting-volume calculations
- Limiting reactant, concentration, percentage yield and percentage purity
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