Formulele: n = [tex] \frac{m}{M} [/tex], unde n = numar de moli
m = masa
M = masa moleculara
n = [tex] \frac{V}{V_{m}} [/tex] , unde V = volumul si [tex]V_{m} = 22,4 L/mol[/tex]
a) [tex]M_{ Cl_{2} } [/tex] = 35,5 · 2 = 71 g/mol
n = [tex] \frac{71g}{71g/mol}[/tex] = 1 mol Cl₂
b) [tex]n = \frac{448 L}{22,4L/mol} [/tex] = 20 moli O₂
c) 1 mol ....... 6,023 · 10²³ molecule
x moli ........12,046 · 10²⁴ molecule
x = 20 moli
