GCSE Chemistry - Relative Formula Mass #24

The video tutorial explains how to find the mass number of elements and the relative atomic mass, denoted as AR. It covers calculating the relative formula mass (Mr) of compounds by adding the relative atomic masses of all atoms in a compound's molecular formula. Examples include magnesium chloride and sulfuric acid. The tutorial also demonstrates how to calculate the percentage mass of an element in a compound, using sulfuric acid and calcium hydroxide as examples.

What is the formula to calculate the percentage mass of an element in a compound?

Calculate the percentage mass of oxygen in calcium hydroxide (Ca(OH)2).