In a chemical reaction, 150 g of  Baking soda mixture containing sodium bicarbonate and vinegar on heating gives 87 g of carbon dioxide gas. What mass of solid residue will be left in food?

According to the law of conservation of mass, the total mass of the products is equal to the total mass of the reactants. Mathematically,

Mass of reactants = Mass of products

We are given that the mass of the baking soda mixture is 150g and the mass of formed carbon dioxide is 87g. So with the help of law we can find the mass of residue as follows: 

Mass of baking soda mixture = Mass of carbon dioxide + Mass of solid residue

150g = 87g + Mass of solid residue

Then, the mass of solid residue will be, 150 - 87 = 63g

Hence, 150 g of baking soda mixture, which is the reactant on heating, produces 63g of solid residue and 87g of carbon dioxide as a product.