H2S
raport atomic=r . a.
r.a.=2H :1S=2:1
raport de masa=r . m.
r.m.=2AH : AS=2:32=1:16 [se simplifica cu 2 ]
Compozitia procentuala prin masa moleculara
MH2S=2+32=34-------->1mol=34g
34gH2S-------2gH-----------32g S
100 g H2S ------Xg-------------yg
x=100.2 :34=5,88 la suta H
y=100.32 : 34=94,11 la suta S
