CaO oxid de calciu sau var nestins
Comp. proc. se calculeaza prin :masa moleculara
raport de masa
MCaO=40+16=56
56 g CaO------------------40gCa----------16 g O
100g Ca O----------------X ------------------Y
x=100.40:56=71,42 la suta Ca
y-100.16:56=28,57 la suta O
Prin raport de masa: 40:16=10:4=5:2 cele doua mase s-au simpl. prin
4 si apoi prin 2
se aduna partile 5+2=7
7gCaO-----------5gCa------------2 g O
100------------------X---------------------Y
Calculeaza si trebuie sa-ti dea la fel procentele
