Chemistry Formulas

  A_r = (Atomic mass x abundance %) + (Atomic mass x abundance %)

% Purity = (mass of pure substance/total mass) x 100

Mass = moles x mass of 1 mole

Moles = mass/ M_r

1 mole = 24 dm³

Concentration = Amount of solute/Volume of solution

% Yield = (Actual mass of product obtained/Theoretical mass of product) x 100

Enthalpy change (ΔH) = Energy in – Energy out

R_f = Distance from origin to dot/ Distance from origin to solvent front