Question

state the law of of mass ​

Answer 1

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations. According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

Answer 2

did you mean law of conservation of mass....

if yes...

then theee goes your amswer..

it states that mass can neither be created nor be destroyed...

for explanation:-
mass can't be created in simple words you can't create it and at the same time you can't destroy it..so mass will not change ..
see dimple enough..

hope it helped