Which state of matter has a definite volume and takes the shape of its container? liquid
gas
solid

solid

Explanation:

liquid can't take the shape of the container because it flows freely and it doesn't have a definite shape and it has space between it e.g water

gas also doesn't shape and e. g air

but solid takes a definite shape because it doesn't have space in between of

the law of conservation of mass states that in a chemical reaction, the total mass of reactants is equal to the total mass of products. because atoms are only rearranged in a chemical reaction, there must be the same number of sodium atoms and chlorine atoms in both the reactants and products