se aplica formula : n=m :M in care n=nr. de moli ; m=cantit .
de subst. (g )
M=masa molara a subst.
n=m: M ( g/moli )
m=n.M
m=5moli .98g/moli=490 g H2SO4
MH2SO4=2+32+4.16=98------>1mol=98g
98g H2SO4------------32 g S
490g ----------------------yg S
Y=490.32 :98=160 gS