Răspuns:
A,Mg=24g/mol
A,C=12g/mol
A,O=16g/mol
niuMg: niuC: niuO= 2/24 : 1/12 : 4/16
=0,0833:0,0833 : 0,25 /0,0833
=1 : 1 : 3
MgCO3---> MgO + CO2↑ r. descompunere
Y Z
CO2+ Ca(OH)2---> CaCO3↓ + H2O r.schimb
W
CaO + 2HCl---> CaCl2 + H2O r.schimb
T
Explicație: