Moles & the mole equation
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11 Terms
The relative formula mass of a compound is the sum of the…
Relative atomic masses of the atoms in the compound
The small numbers after an element tells us…
How many atoms of that element there are
In Al₂(SO₄)₃, how many oxygen atoms are there?
4 × 3 = 12 atoms of oxygen
In Al₂(SO₄)₃ , how many atoms of Sulphur are there?
1 × 3= 3 atoms of sulphur
The mole
unit used to measure the amount of a substance
One mole of any substance contains
6.02 × 10²³ particles (atoms, molecules, or ions).- according to avogadros constant
Equation for the number of moles (n)
N = m / Mr
Atom
A tiny particle that is the smallest amount of an element that can exist
Molecule
More than one atom chemically bonded together to form a distinct unit
Calculate the mass in grams of 2 moles of water
RFM of water = 18
M = n x RFM
Therefore the Mass = 36g
Note 
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