Răspuns:
SO2
32g.....32g 02...64gDO2
x.....y......100g SO2
y=32×100/64=50% O
x=100-50=50%S
Ca(NO3)
40g CA.........28
N.........96g
O...........164g CA(NO3)2
x............y.......z..........100CA(NO3)2
x=40×100/164=24,39%CA
y=28×100/164=164=17,07%
z=100-24,39-17,07=58,54%O
Sper ca te am ajutat