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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