Question

Ce cantitate de oxid de cupru reactioneaza cu365g solutie HCl de concentratie 30%.

Answer 1

        x g       109,5g
         CuO +2 HCl=CuCl2 + H2O
        80g     2.36,5g

Din solutia de HCl reactioneaza numai  md

c=md.100:ms
md =c.ms :100
md=30.365:100=109,5 g HCl

x=80.109,5:2.36,5=120 g CuO