Question

what is law of conservation of mass? is this law followed in all chemical reactions? give example to suppoy your answer?​

Answer 1

It states that mass can either be created nor can be destroyed , it can only change from one form to another.For example when wood burns the product of it equals to the mass of wood.

Answer 2

Law of conservation of mass:Mass can neither be created nor be destroyed in a chemical reaction

yes it is followed in almost all the chemical reactions to make them balanced  chemical reaction from skeletal chemical reaction(unbalanced).

chemical reactions follow this law to make the number of atom of each element on the LHS equal to RHS (or vise-versa).

e.g-

H2(hydrogen)+O2(oxygen)=2H2O(water)