Question

Peste o cantitate de oxid de cupru se adauga 25 de grame de solutie de acid clorhidric de concentratie c=36%.Calculati cantitatea de oxid de cupru care participa la reactie. CAT MAI REPEDE!

Answer 1

   
          x            9g
         CuO +2 HCl= CuCl2 + H2
         80g      2.36,5 g

Intr-o reactie chimica ,dintr-o solutie reactioneaza numai masa subst. dizolvate  md .

c=md .100:ms
md=c.ms:100                                            MCuO=64+16=80
md=36.25:100=9 g HCl                              MHCl=1 +35,5=36,5
                                                                      
x=80.9:2.36,5=9,86 g CuO