m(KOH)=10/(39+16+1)=0.2

M(HCl)=30/(1+35.5)=0.8

 0.2     0.8

KOH + HCl = KCl + H2O

   1       1

недост.

0.2/1=x/1

x=0.2

m(KCl) = 0.2*(39+35.5) = 14.9г