Dalton’s Law Calculator
Add partial pressures of up to four gases, or find one gas's partial pressure from its mole fraction and the total pressure, in kPa, atm, mmHg or bar.
Chemistry
20 tools
Tools in this category
Ideal Gas Law Chemistry
Solve the ideal gas equation PV = nRT for pressure, volume, moles or temperature in atm, litres, mol and kelvin, with R = 0.082057 L·atm/(mol·K).
Vapor Pressure Calculator
Find the vapor pressure of water, ethanol, benzene or acetone at any temperature with the Antoine equation, shown in mmHg, kPa and atm.
Partial Pressure Calculator
Find a gas's partial pressure from its mole fraction and the total pressure, or from n, T and V. Results in kPa, atm, mmHg and bar with the working.
Boiling Point Elevation
Find how far a dissolved solute raises a solvent's boiling point from molality or masses, with Kb values for water, benzene, ethanol and four more.
Molecular Weight Calculator
Type a chemical formula with brackets or hydrate dots and get its molar mass in g/mol, atoms per unit and each element's mass share, from IUPAC weights.
Mole Fraction Calculator
Find the mole fraction and mole percent of each species in a mixture of two to four components from their amounts in moles, with the working shown.
Grams to Moles
Convert grams to moles by typing a chemical formula or a molar mass. Shows molar mass, millimoles and particle count; 18 g of water is 0.9992 mol.
Mole to Grams
Convert moles to grams by multiplying by molar mass. Pick water, NaCl, CO2, glucose and more, or type any molar mass; also shows the particle count.
Mole Calculator
Convert grams to moles, moles to grams, or a particle count to moles using n = m/M and the exact Avogadro constant 6.02214076 × 10^23 per mol.
Molarity Calculator
Find molarity from solute mass, molar mass and volume, or the grams to weigh for a target mol/L. 5.844 g NaCl in 1 L gives 0.1 M.
pH to H+
Convert pH to hydrogen ion concentration [H+] in mol/L using [H+] = 10^-pH, with pOH and hydroxide [OH-] at 25 °C. pH 3.5 gives 3.16 × 10^-4 M.
Molality Calculator
Find molality in mol/kg from solute mass and molar mass, or from moles, with the solvent in grams or kilograms. Shows moles and mass percent.
pOH Calculator
Find pOH from hydroxide concentration, hydrogen ion concentration or pH, with pH, both ion concentrations and the working using pKw = 14.
pH Calculator
Find pH and pOH from a strong or weak acid or base, or from [H+] or [OH-]. Weak acids use the exact Ka quadratic, e.g. 0.1 M acetic acid gives pH 2.88.
pKb Calculator
Find pKb from a Kb value, from the conjugate acid's pKa, or from base concentration and [OH⁻]. Shows Kb, Ka and pKa with an adjustable pKw.
Atom Economy Calculator
Find the atom economy of a reaction from product and reactant molar masses and coefficients, with by-product mass and a step-by-step working.
pKa Calculator
Convert an acid dissociation constant Ka to pKa, or back out pKa from a buffer's pH and its base-to-acid ratio. Ka 1.8 × 10⁻⁵ gives pKa 4.74.
Molecular Mass Calculator
Type a chemical formula such as Ca3(PO4)2 or CuSO4·5H2O and get its molar mass in g/mol, with each element's atom count and mass share.
Formula Weight Calculator
Type a chemical formula with brackets or hydrate dots and get its formula weight in g/mol, with an element-by-element mass breakdown from IUPAC weights.