Question

Va rog enorm
dau si coroana​

Answer 1

Răspuns:

-calculez masa si moli azotat de aluminiu

c=mdx100/ms---> md= 20x426/100g= 85,2g

miu= 213g/mol

niu=m/miu-= 85,2/213mol=0,4mol

-calculez moli Al(OH)3 din ecuatia

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

3NaOH + Al(NO3)3---> Al(OH)3+ 3NaNO3

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

x= niu=0,4molAl(OH)3

-calculez moli si masa Al2O3 .din ecuatia

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

2Al2O3----> Al2O3+ 3H2O

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

x=niu= 0,2mol Al2O3

miu,Al2O3= 102g/mol---> m= niuxmiu= 0,2x102g= 20,4gAl2O3

-CALCULEZ % de Al2O3

34g sitall............................20,4g Al2O3

100G................................................x

x= 60%

vezi explicatiile din text

Explicație: