V2O5 ==> raport atomic: 2:5
raport de masa ==> 102g:80g==>51g:40g
MV2O5=182g/mol
%V=mV/M*100=102/182*100=CALCULEAZA!!
%O=mO/M*100=80/182*100=CALCuleaza!!
AgNO3 ==> raport atomic= 1:1:3
raport de masa = 108g;14g;48g==>54g:7g:2g
MAgNO3=170g/mol
%Ag=mAg/M*100=108/170*100=CAlculeaza!!
%N==>
%O==>
CrCl3 ==> raport atomic; 1:3
Raport de masa ==> 52g;106.5g
%Cr=mCr/M*100==>
%Cl=mCl/M*100==>
H3PO4 ==> raport atomic = 3:1:4
raport de masa==> 3g:31g:64g
%H=mH/M*100==>
%P=mP/M*100==>
%O=mO/M*100==>