Skip to Main Content


The content provides a foundational understanding of key concepts in general chemistry relevant for the MCAT, focusing on stoichiometry, kinetics, equilibrium, and LeChatelier's Principle, alongside essential basics such as empirical and molecular formulas, moles, equivalents, and the principles of stoichiometry.
  • Empirical formulas represent the simplest whole number ratio of elements in a compound, contrasting with molecular formulas that show actual atom counts.
  • A mole is a unit representing 6.02 x 10^23 of something, crucial for quantifying substance amounts in chemistry.
  • Equivalents measure the moles of a particular atom within a mole of a compound, often used for hydrogen in acids.
  • Conversion between mass and moles is facilitated by the molecular weight, enabling calculations of substance amounts in reactions.
  • Stoichiometry is used to determine compound compositions and reaction products, with concepts like percent composition and yield, and identifying limiting and excess reagents in reactions.
Understanding Empirical and Molecular Formulas
Converting Mass to Moles
Introduction to Stoichiometry