Question

Va rog este urgent!Dau coroana

Answer 1

Răspuns:

c=mdx100/ms

calculez masa de CuSO4 din solutie

md= 20x320/100g= 64g CuSO4

Calculez moli CuSO4 stiind miu= 160g/mol

niu=m/miu= 64/160mol= 0,4mol CuSO4

deduc moli si masa NaOH

1mol...............2mol...............1mol

CuSO4 + 2NaOH-----> Cu(OH)2↓+Na2SO4

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

x= niu= 0,8mol NaOH

m= niuxmiu= 0,8molx40g/mol= 32gNaOH=md

calculez masa de solutie NaOH

ms= mdx100/c= 32x100/10g= 320g

calculez masa de precipitat, stiind  miu Cu(OH)2=98g/mol

niu=y= 0,4mol Cu(OH)2

m=niuxmiu= 0,4x98g=39,2g Cu(OH)2