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CHEMISTRY UNIT 3 - CHEMICAL FORMULAE, EQUATIONS & AMOUNT OF SUBSTANCES
CHEMISTRY UNIT 3 - CHEMICAL FORMULAE, EQUATIONS & AMOUNT OF SUBSTANCES 
The Mole & Mass
Number of moles in given mass = mass in g (of an element or compound mass ÷ M (of element or compound)
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1 mole = Avogadro number of particles - 6.02 x 10 (23) - could be atoms, molecules or electrons
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If mass seems to change, usually gas involved
Relative Formula Mass
Compounds have a relative formula mass, M, = relative atomic masses of all the atoms in the molecular formula added together
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Relative atomic mass, A is mass number from Periodic Table
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