Stoichiometry
The Mole Calculator converts between the five quantities connected by the mole concept: number of moles (n), mass in grams (m), molar mass (M), number of particles (N), and gas volume at STP (V). Enter any known value and the molar mass to compute all others simultaneously. The core formulas are n = m / M for mass-to-moles, m = n × M for moles-to-mass, N = n × 6.02214076 × 10^23 for moles-to-particles, and V = n × Vm for moles-to-gas-volume where Vm is 22.414 L/mol (classic STP, 0°C and 1 atm) or 22.711 L/mol (IUPAC STP, 0°C and 100 kPa). A quick-select substance list covers 18 common compounds including water, NaCl, CO2, glucose, ethanol, and sulfuric acid. Step-by-step working is displayed with the user's actual values substituted into each formula step, matching how a chemistry teacher would show the calculation on a board.
