What is the gas when baking soda and vinegar are mixed together?

the ingredient that reacts in baking soda is sodium bicarbonate (NaHCO3). the ingredient that reacts in vinegar is acetic acid (CH3COOH). acetic acid donates its proton (H) and sodium bicarbonate loses its Na. NaCH3COO and H2CO3 form. H2CO3 decomposes intoH2O and CO2 which are both gasses. Carbon Dioxide (CO2) is the gas produced.