Question

calculati masa Zn de puritati 26% folosita in reactia H2Cl care rezulta 8,96 l de H2. Aflati masa impura a Zn​

Answer 1

Răspuns:

-CALCULEZ moli H2

niu=V/Vm= 8,96/22,4 mol=0,4molH2

-deduc, din ecuatia chimica, moli Zn

1mol...................................1mol

Zn +  2HCl------> ZnCl2 + H2

x.........................................0,4mol

x=niu= 0,4molZn

m= niuxM=0,4x65g=26gZn pur

calculez masa de Zn impur,din purutate    p= m,px100/.m,i

m,i= 26x100/26g=100g Zn impur

impuritati=m,impura-m,pur=100-26=> 74g

Explicație: