Easy Summary for Mole concepts and Equations for A level
Relative atomic mass is the weighted average mass of naturally occurring atoms of an element on a scale where an atom of carbon-12 has a mass of exactly 12 units. Relative molecular mass, relative isotopic mass and relative formula mass are also based on the 12C scale.■ The type and relative amount of each isotope in an element can be found by mass spectrometry.
■ The relative atomic mass of an element can be calculated from its mass spectrum.
■ One mole of a substance is the amount of substance that has the same number of particles as there are in exactly 12g of carbon-12.
■ The Avogadro constant is the number of a stated type of particle (atom, ion or molecule) in a mole of those particles.
■ Empirical formulae show the simplest whole number ratio of atoms in a compound.
Empirical formulae may be calculated using the mass of the elements present and their relative atomic masses or from combustion data.
■ Molecular formulae show the total number of atoms of each element present in one molecule or one formula unit of the compound.
■ The molecular formula may be calculated from the empirical formula if the relative molecular mass is known.
■ The mole concept can be used to calculate: – reacting masses – volumes of gases – volumes and concentrations of solutions.
■ The stoichiometry of a reaction can be obtained from calculations involving reacting masses, gas volumes, and volumes and concentrations of solutions.
Cameroon Gce Revision Questions
Mole concept and equations revision questions
gce
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