niu= 2molCa impur
p= niu,purx100/niu,impur---> niu,pur=1,9molCa
M,CaO= 56g/mol; Vm= 22,4l/mol
1mol..........11,2 l.......56g
Ca + 1/2O2----> CaO
1,9mol........x.................y
x=1,9x11,2 l=...................calculeaza !
y= 1,9x56 g=.....................calculeaza !