aqa alevel chemistry equations

Equation for moles

moles=mass/Mr

Equation for concentration

concentration = moles/volume

equation for molar gas volume

volume=moles x 24

equation for number of particles

number of particles = moles x Avogadro's number

Ideal gas equation

pV=nRT

where p is pressure (Pa), V is volume (m³), n is number of moles, R is the ideal gas constant, and T is temperature in Kelvin.

Equation for atom economy

Atom economy = (Mr of desired products / total Mr of reactants) x 100%

Equation for percentage yeild (%)

Percentage yield = (actual yield / theoretical yield) x 100%

Equation for enthalpy change

Enthalpy change = total energy of products - total energy of reactants

Equations for average bond enthalpy

Average bond enthalpy=Sum of bond enthalpies in reactants - Sum of bond ethalpies in products

Equation for EMF

E= E right hand side-E left hand side (E is electrode potential)

Gibbs Free energy equation

Gibbs Free energy (G) = Enthalpy (H) - Temperature (T) x Entropy (S)

Equation for equilibrium constant wrt concentration

Kc = [products]^[coefficients] / [reactants]^[coefficients]

Equation for equilibrium wrt pressure

K= (D)(E) / (A)(B)

Equation for Rate

Rate= k [reactants] [products]

Equation for pH

pH= -log₁₀ [H+]

Equation for Kw

Kw= [H+][OH-]

Equation for pKa

pKa= -log₁₀ Ka

Equation for Ka

Ka= [H+][A-] / [HA]