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Molecular Formula - GCSE Chemistry Definition

Reviewed by: Alexandra Brennan

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What is molecular formula?

In GCSE chemistry, the molecular formula of a compound represents the exact number of atoms of each element present in a molecule.

Unlike the empirical formula, which shows the simplest whole-number ratio of atoms, the molecular formula provides the actual composition. For example, the molecular formula of glucose is C₆H₁₂O₆, while its empirical formula is CH₂O. It is determined using the relative molecular mass and the empirical formula. Understanding molecular formulas is essential in GCSE Chemistry for identifying substances and balancing chemical equations accurately.

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Alexandra Brennan

Reviewer: Alexandra Brennan

Expertise: Chemistry Content Creator

Alex studied Biochemistry at Newcastle University before embarking upon a career in teaching. With nearly 10 years of teaching experience, Alex has had several roles including Chemistry/Science Teacher, Head of Science and Examiner for AQA and Edexcel. Alex’s passion for creating engaging content that enables students to succeed in exams drove her to pursue a career outside of the classroom at SME.

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