How does the law of conservation of mass related to balancing of chemical reaction?

Answer 1

The Conservation of Matter states that matter cannot be destroyed or created. Therefore in a reaction the masses of the reactants and products remain constant. In balancing a reaction the law applies in that all atoms must be accounted for and equalized across both sides of the equation.

Answer 2

Because, you cannot lose or gain any additional mass/moles in the products.

For example;

If you have 1 gram of hydrogen, and 1 gram of oxygen, the mass of the product (H2O) has to be eqaul to 2 grams (add reactants) or less then 2 grams and have some of the mass lost as a gas escaping. Assuming this is in a open system. The same works for the number of moles (your balancing) so the law is what makes balancing possible because it sets parameters for us to follow as Chemists.

Answer 3

Because of the law of conservation of matter, we know that the mass of the reactants must equal the mass of the products. We also know that in a chemical reaction the atoms are only rearranged, so that the atoms that were in the reactants are the same atoms that are in the products. Therefore, when we balance a chemical equation, we add coefficients in front of the chemical formulas so that the number of atoms of each element is the same on both sides.

Answer 4

Because you can conserve chemicals, dah!