Mole map (chemistry)

In chemistry, a mole map (also called a mole road map or stoichiometric map) is a graphical representation of the relationships between the mole, molar mass, number of particles (atoms, molecules, ions), volume for gases at standard temperature and pressure (STP), and coefficients from balanced chemical equations.^[1] Mole maps are widely used in teaching basic principles of stoichiometry and unit conversion in undergraduate-level and high school chemistry courses.^[2][3]

Structure

A mole map typically illustrates the following core relationships:

• Moles to mass: Using the molar mass (g/mol) to convert between moles and grams.
• Moles to particles: Using Avogadro's number (6.022 × 10²³ particles/mol) to convert between moles and number of particles.
• Moles to volume (gases): At STP, 1 mole of any ideal gas occupies 22.4 liters.
• Mole ratios: Coefficients in balanced chemical equations provide ratios for converting between moles of reactants and products.

The map often features arrows or pathways guiding the user between these units based on known information and desired quantities.^[4]