learning objectives: to understand what is meant by the term, ‘relative molecular mass’
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Learning Objectives:• To understand what is meant by the term, ‘relative molecular mass’
What is Relative Molecular Mass
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Relative Molecular Mass, Mr
Mr is the relative molecular mass of a compound.
This is the mass of the compound relative to the mass of 12C.
It is easy. Just add up the masses of the atoms in the molecule.
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Masses of MoleculesExampleH2 contains 2 x hydrogen atoms.
Hydrogen atoms have a relative mass of 1, so H2 has a relative mass of:
H H HH
mass = 1 mass = 1 H2
2 x 1 = 2g
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Masses of MoleculesExampleCO2 contains 1 x carbon atom and 2 x oxygen atoms.carbon atoms have a relative mass of 12, and oxygen atoms have a relative mass of 16.
The sum is: (1 x 12) + (2 x 16)= 12 + 32= 44g
CO O
16 12 16