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Balanced chemical reaction of baking soda

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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!