Răspuns:
Explicație:
MgCO3
M= 24 +12 +3 .16= 84------> 84g/moli
84 g MgCO3---------24 gMg-------12g C --------48 g O
100g------------------------x-------------------y-----------------z
x= 10 0 . 24 : 84 = 28,57% Mg
y= 100 . 12 : 84 = 14,29% C
z= 100 .48 : 84 = 57,14% O