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1.2.1 Molar Mass (Relative Atomic Mass (Taking into consideration all its…
1.2.1 Molar Mass
Relative Atomic Mass
Taking into consideration all its isotopes and their abunduncies
Relative to Carbon-12
The mean mass of an atom of an element
Molar Mass
Molecular weight
Molecular mass
Formula Mass
Formula Weight
The molar mass (Mr) of a substance is calculated by adding up the atomic masses of all the atoms present in the formula.
Mr is measured using grams per mole (g/mol
Calculation without Polyatomic ions
Carbon Dioxide
2O=2(16.00)=32.00
Mr=44.01 g/mol
1C=1(12.01)=12.01
Calculation with polyatomic ions and Brackets
Aluminium Nitrate
Mr=213.01 g/mol
9O=9(16.00)=144.00
3N=3(14.01)=42.03
1Al=1(26.98)=26.98
Calculation of Diatomics
Chlorine
2Cl=2(35.45)=70.90 g/mol