Question

o cantitate de 3,50 Zn impur reactioneaza cu H2SO4 si degaja 0,1 g H2.Calculati puritatea zincului utilizat,va roggg

Answer 1

din ecuatia reactiei calculeaz masa de Zn pur, stiind A,Zn=65g/mol,A,H=1g/mol

1mol................................1mol
Zn +H2SO4-----> ZnSO4  +H2
65g.....................................2g
x.........................................0,1g
x=m,Zn pur= 3,25g

-calculez puritatea zincului, p/100= m.pur/m,impur
p%= 3,25x100/ 3,50=.........................calculeaza