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Mendeleev · Tools
Chemistry tools
Write and analyze formulas, calculate, compare elements and search for compounds.
Chemistry
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H₂O
Chemical Formula EditorWrite formulas, ions and equations with correct formatting.
→ΣChemical Formula AnalyzerBreak a formula into elements, atom counts and mass contributions.
→g/molMolar Mass CalculatorCalculate the molar mass of a chemical formula.
→%Percent CompositionCalculate the mass percentage of each element.
→#Atom CounterCount atoms through parentheses and hydrate notation.
→1s²Electron ConfigurationFind the ground-state electron configuration of an element.
→¹⁴CIsotope & Ion NotationBuild notation from Z, A and charge.
→↔Compare ElementsCompare two elements using the same dataset.
→118Interactive Periodic TableSearch, filter and inspect all 118 elements.
→⌕Compound SearchSearch Mendeleev compounds and extend through PubChem.
→Laboratory calculations
Calculate from measured quantities
→?
Complete a reactionEnter only the reactants: the tool suggests products for a common case, then balances it.
→⚖Balance equationsFind the smallest whole-number coefficients and verify conservation.
→NMole, mass & particlesConvert between grams, moles and chemical entities.
→C₁Dilution calculatorSolve C₁V₁ = C₂V₂ with unit conversion.
→PVIdeal gas lawSolve PV = nRT for P, V, n or T.
→pHpH calculatorRelate pH, pOH, [H₃O⁺] and [OH⁻] at 25 °C.
→ρDensity, mass & volumeSolve ρ = m/V with common laboratory units.
→Stoichiometry and solutions
Follow quantities through a reaction
ν
Stoichiometry CalculatorUse a balanced equation to convert a known amount into a target amount.
→minLimiting ReactantFind which reactant runs out first and the maximum product amount.
→cMolar ConcentrationCalculate mol/L from solute amount and final solution volume.
→mSolution PreparationCalculate the solute mass for a target concentration and volume.
→%Reaction YieldCompare actual and theoretical amounts or solve for either value.
→Q/KReaction Quotient Q/KCalculate Q and compare it with K to read the direction toward equilibrium.
→Shared engine
Consistent calculations across tools
Formula tools share the same element dataset and parsing logic for parentheses and hydrates. Compound search starts with Mendeleev pages and can query PubChem on demand.