Răspuns:
Explicație:
4Al + 3O2= 2Al2O3
2NH3= N2 +3H2
CuCO3= CuO + CO2
H2 + Cl2= 2 HCl
M CuCO3=64 + 12 + 3.16= 124--------> 124g/moli
MNH3= 14 + 3= 17------> 17g/moli
17 g NH3-------14g N--------3g H
100g---------------x----------------y
x= 100 . 14 : 17 = 82,35% N
y= 100.3 : 17 = 17,65% H
MHCl= 1 + 35,5=36,5-------> 36,5 g/moli
36,5g HCl-----------1g H
73g HCl-------------xg H
x= 73 .1 : 36,5 = 2 g H