Question

Urgent VA ROG:

Calculati masa de Al si nr de moli de H2 prin reactia Al cu 150g sol. H2SO4 de concentratia 20% .

Answer 1

Răspuns:

ms=150g

C=20%

md=C×md/100=150×20/100=30gH2SO4

MAl27g/mol

MH2SO4 =2×1+32+4×16=98g/mol

2×27g......3×98g

2Al+ 3H2SO4 => Al2(SO4)3+3H2

xg............30g

x=30×2×27/3×98=5,51g Al

calculăm nr de moli de H2

n=m/M=30/98=0,3 moli H2SO4

3 moli...................................3moli

2Al+ 3H2SO4 => Al2(SO4)3+3H2

0,3moli..............................ymoli

y=3×0,3/3= 0,3 moli H2