Reacting Masses

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  • Created by: Lily04
  • Created on: 20-04-17 13:58

Relative Atomic Mass, Ar:

Each element in he periodic table has two numbers. The larger number is the mass number.Related image

Relative Formula Mass, Mr

The relative formula mass of a compound is the sum of the relative atomic masses of all the atoms present in the formula.

Follow these steps to calculate Mr:

  • Write down the formula of the compound.
  • Multiply the number of atoms of each element in the formula by its Ar
  • Add them all up.

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