GCSE Chemistry - Relative Formula Mass | Mr & Percentage Mass Calculations (2026/27 exams)

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** WHAT'S COVERED **
1. Relative Atomic Mass (Ar)
The difference between Mass Number and Relative Atomic Mass.
How Ar is the average mass of an element's isotopes.
2. Relative Formula Mass (Mr)
How to calculate the Mr of a compound by adding the Ar of all its atoms.
Worked example: calculating the Mr of Magnesium Chloride.
Worked example: calculating the Mr of Sulfuric Acid.
3. Percentage Mass of an Element in a Compound
The formula for calculating the percentage mass of an element.
Worked example: calculating the percentage mass of sulfur in sulfuric acid.
Worked example: calculating the percentage mass of oxygen in calcium hydroxide.

** CHAPTERS **
0:00 Introduction
0:16 Mass Number and Relative Atomic Mass
1:01 Relative Formula Mass (Mr)
1:21 Calculating Mr: Magnesium Chloride
1:47 Calculating Mr: Sulfuric Acid
2:09 Calculating Percentage Mass of an Element

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