5 x 1 hour lessons

This core module builds fluency with all the essential chemical calculations you'll need for exams and practical work. You'll begin by learning how to calculate relative molecular and formula masses and use the concept of the mole to connect mass, amount, and number of particles.

You’ll also practise using balanced equations to calculate reacting masses, gas volumes, and solution concentrations. Particular attention is given to handling limiting reagents, percentage yield, and atom economy — vital for exam questions and real-world chemical processes.

By the end of this module, you'll be able to:

• Use Avogadro’s number to calculate the number of particles in a substance

• Calculate the amount of substance in moles from mass, volume (gas), or concentration (solution)

• Interconvert between moles, masses, and volumes using balanced chemical equations

• Determine limiting reagents and calculate percentage yield

• Calculate atom economy of a reaction

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OCR (A) specification points covered: 2.1.3 Amount of substance