DACA SUNT m=32g O
---> niu=m/M=32/16molO=2molO
1molatomi.........N,A atomi( NUMARUL LUI AVOGADRO)
2mol..................x =2N,A= 2X6,023X10²³atomiO= 12,046X10²³ atO
2XN,A atomi se gasesc in 2 moli de atomi din orice element !!
2XN,A atomi se gasesc in: 2mol H
m=niuxM=2x1gH=2gH
m= 2molx4og/molCa= 80gCa
niu= 2mol at.Ca
niu= 2mol atF
m= 2molPx31g/mol= 62g P