Chemistry Calculators (Page 2)
Concentration, molar mass, reactions and more chemistry tools.
Arrhenius Equation Calculator
Enter the pre-exponential factor A, activation energy Ea, and absolute temperature T to compute the reaction rate constant k = A·e^(−Ea/RT).
Moles to Grams Calculator
Enter the amount of substance (moles) and the molar mass; using m = n·M the tool instantly computes the mass (grams) of solute or reagent needed — the basis of solution prep and stoichiometry.
Percent Composition Calculator
Enter an element's total mass within one mole of the compound and the compound molar mass; the tool instantly computes the mass percent composition (element% = element mass ÷ compound molar mass × 100%).
Boyle's Law Calculator
Enter initial pressure, initial volume and final pressure to instantly compute the final gas volume under Boyle's law P₁V₁ = P₂V₂ at constant temperature.
Combined Gas Law Calculator
Enter the initial and final pressure, temperature, and initial volume; by the combined gas law P₁V₁/T₁ = P₂V₂/T₂ it instantly computes the gas volume in the new state for a fixed amount of gas.
Gibbs Free Energy Calculator
Enter the enthalpy change ΔH, absolute temperature T and entropy change ΔS; using ΔG = ΔH − TΔS the tool instantly computes the Gibbs free-energy change and judges whether the reaction is spontaneous at that temperature.
Average Reaction Rate Calculator
Enter the initial and final concentrations and the time interval; using rate = |ΔC|/Δt the tool instantly computes the average reaction rate over that period.
First-Order Half-Life Calculator
Enter the first-order rate constant k; using t½ = ln2 / k the tool instantly computes the half-life — the time required for the reactant concentration to halve.
Atom Economy Calculator
Enter the molar mass of the desired product and the total molar mass of reactants to compute atom economy: AE% = desired product ÷ total reactants × 100%.
Percent Error Calculator
Enter the experimental (measured) value and the theoretical (true) value; using %error = |E − T| / |T| × 100% the tool instantly computes the percent error of an experimental result.
Osmotic Pressure Calculator
Enter the van't Hoff factor i, molarity M and absolute temperature T; by the van't Hoff equation Π = i·M·R·T the tool instantly computes the osmotic pressure (atm and kPa).
Charles's Law Calculator
Enter the initial volume, initial temperature, and final temperature; by Charles's law V₁/T₁ = V₂/T₂ the tool computes the gas final volume at constant pressure.