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The Student and Tutor reviewed calculations for molarity and molality. They then learned about and practiced determining empirical and molecular formulas from elemental percentages and molar masses, including a multi-element example. A revision session focusing on practice problems for all covered topics, including isotopes, was planned for the next class.

The Student and Tutor reviewed fundamental chemistry concepts, including the mole concept, mole fraction, molarity, and molality. They extensively practiced applying the definitions and formulas for mole fraction, molarity, and molality through several numerical problems. The session concluded with a discussion of an integrated problem connecting mole fraction to molality.

The Tutor and Student reviewed calculations involving moles, molecular mass, and Avogadro's number, including determining the number of moles and molecules from given masses. They then delved into the concept of limiting reagents, practicing how to identify them in chemical reactions. The session concluded with an introduction and practice on different types of percentage composition in solutions: mass percentage, volume percentage, and mass by volume percentage.

The tutor and student reviewed key chemistry concepts including matter classification, significant figures in calculations, and the laws of chemical combination (Conservation of Mass, Definite Proportion, Multiple Proportions). They also began exploring the mole concept and Avogadro's number, practicing calculations for moles of substances. The next session will focus on more numerical problems and empirical formulas.

The Student and Tutor reviewed the fundamental rules for filling electrons in atomic orbitals, including the Aufbau principle, Hund's Rule of Maximum Multiplicity, and the Pauli Exclusion Principle. They applied these rules to write electronic configurations for various atoms, discussing special cases like Chromium and Copper due to enhanced stability. The Tutor assigned practice for electronic configurations using the periodic table, and they briefly confirmed previous work on isotope numericals before planning to start a new topic next session.

The Tutor and Student reviewed fundamental concepts in atomic structure, focusing on the wave mechanical model and the four quantum numbers (principal, azimuthal, magnetic, and spin). They clarified how these numbers define electron behavior, subshells, and orbital shapes, and differentiated between 'orbits' and 'orbitals.' The Student practiced identifying quantum numbers for specific subshells, and the Tutor assigned a review of these concepts in preparation for discussing electron filling rules in the next class.