It is the relative molecular / formula mass:
- The sum of the relative atomic masses of the atoms shown in a compound or formula
example: Find the Mr of H2O
● H = 1
● 1 × 2 (since there are two H atoms in H2O)
● = 2
○ O = 16
○ 16 × 1 (since there is only one O atom in H2O)
○ = 16
Mr will be the sum of two of these masses:
= 2 plus 16
= 18 g/mol
- The sum of the relative atomic masses of the atoms shown in a compound or formula
example: Find the Mr of H2O
● H = 1
● 1 × 2 (since there are two H atoms in H2O)
● = 2
○ O = 16
○ 16 × 1 (since there is only one O atom in H2O)
○ = 16
Mr will be the sum of two of these masses:
= 2 plus 16
= 18 g/mol
(edited 5 years ago)
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