2moli KOH
m KOH
se foloseste rel.: n=m:M in care n=nr. de moli ; m=masa subst.
M=masa molara
n=m : M
m=n .M
m=2moli . 56 g/moli=112 g KOH
MKOH=39+16 + 1=56------->56g/moli
