Whats the equation for solid sodium carbonate being heated in a a crucible?

Question

Whats the equation for solid sodium carbonate being heated in a a crucible?

Answer 1

Anhydrous sodium carbonate melts at 851°C (1124 K); however, it gradually decomposes in the temperature range from more than 500 K to 900 K

Na2CO3(s)  CO2(g) + Na2O(s)

Sodium bicarbonate is even less stable with respect to heating. Solid NaHCO3 begins to lose carbon dioxide and water around 100°C, with complete conversion to sodium carbonate by 200°C:

2 NaHCO3(s)  CO2(g) + H2O(g) + Na2CO3(s)

Answer 2

Na2CO3--->CO2 + Na2O