Question

va rog rezolvati ex astea am timp 20-30 min​

Answer 1

Răspuns:

1.

MAl=27g/mol

MO2 =2×16=32g/mol

4×27g.....3×32g

4Al + 3O2 => 2Al2O3

54g.........xg

x=54×3×32/4×27=calculează

2.

100g CaCO3........10g CaCO3 pur

200g CaCO3.......xg CaCO3 pur

x=200×10/100=20g

MCaCO3=40+12+3×16=100g

MH2SO4 =2×1+32+4×16=98g/mol

100g..................98g

CaCO3 + H2SO4 => CaSO4 + H2O

20g...................yg

y=20×98/100= calculează