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1. Atoms and Reactions
1.2 Moles and Equations
Amount of Substance
Symbol = n
Units = moles (mol)
A mole is the mass of substance that has exactly the same number of particles as there are
atoms in exactly 12g of carbon-12.
Atoms in a Mole
There are (600000000000000000000000) 6.02 x 10^23 atoms of carbon in 12g of carbon-12.
This number is known as Avagadro's constant, NA
NA = 6.02 x 10^23
This is how many particles there are in 1 mol of anything. Number of particles = n x
Molar Mass (M)
Molar mass is the mass of one mole of a substance.
Units = gmol-1