1m³=1000l
1000l..........1,25kgN2
10l..............m= 0,0125kg=12,5gN2
n,mol= m/M= 12,5g/28g/mol=0,446mol N2
1mol contine.....6,023x10²³molec N2 ( numarul lui Avogadro)
0,446mol.....................N= 0,446x6,023x10²³=.............................calculeaza !!!