Created by ellie_ellie
over 10 years ago
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Relative atomic mass (Ar)
Way of saying how heavy atoms are in comparison with carbon 12
Ends up being the same as the mass number
For example helium: mass number = 4 so relative atomic mass = 4.
Relative formula mass (Mr)
Relative formula masses are just the relative atomic masses of a compound (e.g. magnesuim chloride) added together
MgCl2
Mg = 24
Cl2 = (35.5 * 2)= 71
A
A relative formula mass (Ar or Mr) of a substance in grams = one mole of that substance.
Moles
To convert between moles and grams...
Mass in grams (of element or compound)
Mr (of element or compound)
= Number of moles
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