C4.1/C4.2 - Relative mass and moles
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Relative atomic mass
-aka Ar -unit = grams -masses of atoms compared by measuring Ar of carbon -12
Mr
-grams -Ar of compounds
mole
-unit for amount of substance in Ar -formula mass of substance -grams
Avogardo’s constant
• 6.022 x 10 to the power of 23
Equation involving moles/mass/Mr
moles = mass/Mr
Balanced symbol equations relation to moles
-tell you number of moles of substance in reaction
Avogadros constant refers to
Number of atoms per mole Or in a compound number of molecules per mole
Number of atoms using avogadros constant
avogadros constant x amount of moles
Number of atoms in a compound in an amount of moles using avogadros constant
Molecules num = avogadros constant x amount Ans x number of atoms in compound