When the mineral dolomite (caco3·mgco3) is heated, it gives off carbon dioxide and forms a mixture of a metal oxide and a metal

Question

Paha777 [63]

3 years ago

15

When the mineral dolomite (caco3·mgco3) is heated, it gives off carbon dioxide and forms a mixture of a metal oxide and a metal

carbonate. which carbonate is formed?

Chemistry

1 answer:

luda_lava [24] · Answer 1 · 2021-12-08T17:40:09+03:00

$MgCO_3.CaCO_3 ----\ \textgreater \ Heat---\ \textgreater \ CO_2 + MgO + CaCO_3$

Now, question is why MgO but not CaO.

At a dissociation pressure of 1 atm, the temperature at which CO2 and metal oxide is formed is :

For MgCO3 = 540 °C
For CaCO3 = 900 °C”
Also,
<span>The driving force is the larger lattice energy of MgO(3795) vs that of CaO(3414 kJ mol^-1) . More the lattice energy, the more chances of that compound to form.</span>
So MgO is formed first.

Carbonate is Calcium carbonate