Physical Chemistry

Particle in a 1D Box Calculator

$begin mathsize 36px style E equals fraction numerator n squared h squared over denominator 8 m L squared end fraction end style$

E= Energy at the n^th 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

$begin mathsize 48px style capital delta G space equals capital delta H space minus space T capital delta S space end style$

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

$begin mathsize 48px style capital delta G to the power of o space equals space minus space R T ln left parenthesis K subscript e q end subscript right parenthesis space end style$

ΔG^o= Standard Free Energy Change ; R= Universal Gas Constant; K_eq = Equilibrium Constant; T= Temperature

Mass Spectroscopy Fragment Finder Calculator

$begin mathsize 36px style C subscript a H subscript b O subscript c N subscript d end style$

C_aH_bO_cN_d= 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

$begin mathsize 36px style theta equals fraction numerator K subscript e q end subscript P over denominator 1 plus K subscript e q end subscript P end fraction end style$

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

Ionic Strength Calculator

$begin mathsize 36px style I equals 1 half sum for i of c subscript i z subscript i squared space end style$

I = Ionic Strength ; c_i = concentration of the i^thion ; z_i = Charge of the i^th ion

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

$begin mathsize 48px style capital delta H space equals capital delta U space plus space P capital delta V space end style$

ΔH= Enthalpy Change ; ΔU= (U_final - U_initial) Internal Energy Change; ΔV = (V_final - V_initial)Volume Change;

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

$begin mathsize 48px style log space f equals negative A z squared square root of I space end style$

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^-1/2kg-1/2 which corresponds to water at 25^oC)

Dieterici Equation of State: Calculator

$begin mathsize 36px style P e to the power of fraction numerator a n over denominator R T V end fraction end exponent left parenthesis V minus n b right parenthesis space equals space n R T end style$

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

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