Balanced chemical reaction of baking soda

What is the balanced chemical reaction of baking soda and heat? what is the ratio of molecules of carbon dioxide produced to molecules of baking soda consumed?

This was a lab we did in school and we used 2.5g of baking soda and put it in glass tube....

Then we used a bunsen burner and held the flame to the vial and air was released to the water bottle we had fliped over in a bucket of water. There was a hose in the water bottle connecting to the tube of baking soda so as the baking soda was realeasing the the air the water bottle was emptying out. we started off with 540mL of water and went to 331mL of water.
Please Help!
Thanks!

I am assuming you meant what is the balanced chemical equation of baking soda reacting with water?

f you put NaHCO3. then you will get

Na ions and HCO3 ions and the HCO3 ions will abstract a proton from water. This will form carbonic acid (H2CO3) which naturally decomposes to form CO2 gas and water

NaHCO3 + HOH --- Na^+1 (aq) + OH^-1 (aq) + H2CO3 (aq)

H2CO3 (aq) --- CO2 (g) + H2O (l)

To figure ratio:
Take the 540 mL of water you started with, subtract 331mL yield = 209.

So the ratio of 2.5g of Baking soda to water is
2.5/209=.0119617g of baking soda to mL of water.
Or 209/2.5= 83.6mL of water to 1g of baking soda.

thanks broski

This is the thermal decomposition of NaHCO3

2 NaHCO3 → Na2CO3 + H2O + CO2