Chemistry

Estimate two-photon excitation or solve for needed average power from wavelength, pulse width, repetition rate, and beam waist.

Calculate radioactive amount or activity remaining, elapsed decay time, half-life, or initial amount with explicit time units.

Find partial pressure from gas share, moles, ideal gas law, or gas collected over water with clear steps and unit checks.

Calculate dilute-solution osmotic pressure from molarity or solute mass, temperature, particle factor, and your chosen pressure unit.

Solve for q, qmax, Ce, b, or theta and check surface coverage plus RL favorability in one Langmuir isotherm calculator.

Compare gas effusion rates or solve for an unknown rate, molar mass, or ratio with Graham’s law and clear unit checks.

Calculate diffusion coefficient, particle radius, or fluid viscosity with Stokes-Einstein plus easy unit conversions.

Calculate non-standard cell potential from E0, electron count, temperature, and reaction quotient Q or reaction terms.

Calculate lattice enthalpy with a Born-Haber cycle or estimate it from Born-Lande data. See formation and dissociation values.

Calculate ionic strength from each ion’s concentration and charge, check charge balance, and review each ion’s contribution.