xmoli 2moli
2 NaOH + SO2 = Na2SO3 + H2O
2moli 1mol
x=2.2=4moli NaOH
n=m: M [ n=nr. moli ; m=masa subst;. M=masa molara ]
m=n.M
m=4moli . 40g/moli=160g NaOH [ md sol . de NaOH ]
-se afla ms sol. de NaOH
ms=md.100: c
ms=160 . 100 : 15=1066,6 g sol. NaOH
MNaOH=23+16+1=40----->40g/moli