Chemistry topic
Formula & Molecular Mass
Move between molecular formulas, composition, mass, amount, and particles.
Calculators
Molecular Weight CalculatorEnter a chemical formula. The calculator gives its molar mass, molecular weight, atom count, and element composition.Molar Mass CalculatorCalculate molar mass from an explicit chemical formula using versioned atomic-weight data.Grams to Moles CalculatorConvert a sample mass to moles from its chemical formula or molar mass.Moles to Grams CalculatorConvert moles to a selected mass unit from a chemical formula or molar mass.Moles CalculatorCalculate moles from an amount, sample mass, or particle count.Empirical Formula CalculatorFind the smallest whole-number formula from element masses or percentages.Molecular Formula CalculatorFind a molecular formula from an empirical formula and measured molar mass.
Core relationships
These equations form an accessible map of the quantities used across this topic.
- M = Σ(nᵢAᵢ)
- n = m/M
- N = nNₐ