## Particle in a 1D Box Calculator

E= Energy at the nth state; n = quantum number ; h= Plank's constant ; m = mass of the particle;   L= Box length

## Gibbs Free Energy Change , Entropy Change & Enthalpy Change Calculator

ΔG= Change in Gibb's Free Energy ; ΔH = Change in enthalpy;  ΔS = Change in Entropy; T= Temperature

## Standard Free Energy Change and Equilibrium Constant Calculator

ΔGo= Standard Free Energy Change ; R = Universal Gas Constant;  Keq = Equilibrium Constant; T= Temperature

## Mass Spectroscopy Fragment Finder Calculator

CaHbOcN= Molecular Formula of Fragment ; a , b, c & d must be an positive integer or 0 (zero)

Use this calculator to predict the molecular fragment obtained in a Mass Spectra.

## Langmuir Isotherm Calculator

Keq = Equilibrium Constant of Adsorbtion;  P = Partial Pressure or Concentration of the absorbate;  θ = The fraction of adsorbent surface covered by adsorbate

## Ionic Strength Calculator

I = Ionic Strength ; ci =  concentration of the ith ion ; zi = Charge of the ith ion

## Enthalpy Change , Internal Energy and Volume Change relation at Constant Pressure Calculator

ΔH= Enthalpy Change ; ΔU = (Ufinal - Uinitial) Internal Energy Change;  ΔV = (Vfinal - Vinitial)Volume Change;

## Debye Hückel Activity Coefficient: Activity coefficient of an ion in a dilute solution

I = Ionic Strength ; z =  Charge number of  an ionic specie ; f = Activity coefficient ;

A= A  constant that depends on temperature.
(A is assumed to be 0.509 mol-1/2 kg
-1/2 which corresponds to water at 25oC)

## Dieterici Equation of State: Calculator

P = Pressure ; V = Volume ;  a , b = Dieterici Constants ; n= Number of Moles ; R= Universal Gas Constant ; T= Temperature