Quantitative Chemistry: Formulas

Formulas taken from CGP

% mass of an element in a compound

% mass of an element in a compound

((A_r × # of atoms of element) ÷ M_r of compound) × 100

# of moles in a given mass

mass (g) ÷ M_r

volume of a known mass of any gas

(mass ÷ M_r) × 24

concentration of a solution (g/dm³)

mass ÷ volume

concentration of a solution (mol/dm³)

# of moles ÷ volume

How do you convert mol/dm³ to g/dm³ ?

Multiply by the relative formula mass.

atom economy

(RFM of desired products ÷ RFM of all reactants) × 100

percentage yield

(mass of product actually made ÷ max theoretical mass of product) × 100