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Amount of Substance

OCR AS-level ChemistryTopic 2 of 1016 lessons

Revision notes for Amount of Substance in OCR Chemistry A (H032). Read the start of any lesson here, then sign in free for the whole lesson, the R.E.C.I.P.E. recall steps and the quiz.

  1. Amount of SubstanceThe easiest way of counting how many particles there are in a substance is to find its mass.
  2. Molar MassThe molar mass is the mass of one mole of any substance in grams and is given the symbol M.
  3. Empirical FormulaThe empirical formula is the simplest whole number ratio of atoms of each element in a compound.
  4. Empirical Formula CalculationThe empirical formula can be calculated using chemical analysis to determine the mass of each element in a compound or the percentage composition by…
  5. Relative Formula MassThe relative formula mass is the mass of a formula unit compared to 1/12th the mass of a carbon-12 atom.
  6. Relative Molecular MassThe relative molecular mass is the weighted mean mass of a molecule compared to 1/12th the mass of a carbon-12 atom.
  7. Molecular FormulaThe empirical formula is the simplest whole number ratio of atoms of each element in a compound.
  8. Hydrated SaltsHydrated salts have water molecules as part of their crystalline structure.
  9. Solutions and ConcentrationsThe mole concentration of a solution is the amount of solute in moles dissolved in each 1 dm3.
  10. Standard SolutionsA standard solution is a solution of known concentration.
  11. Molar Gas VolumeThe molar gas volume Vm is the volume per mole of gas molecules at a stated temperature and pressure.
  12. Ideal Gas EquationThe molecules that make up an ideal gas are in constant random motion.
  13. Reacting MassesA balanced equation gives the reacting ratio of moles of reactants and products or stoichiometry of a reaction.
  14. Limiting Reagent1.15g of sodium reacts with an excess of chlorine forming sodium chloride.
  15. Percentage YieldTheoretical calculations assume all the reactants are converted into products and calculate the maximum possible amount of product or the…
  16. Atom EconomySustainability is the ability to exist constantly in a balanced environment.

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