Question

State law of conservation of mass?

Answer 1

In a chemical reaction, you can have reactants than come together to form product(s). The mass of the reactants will equal the mass of the products. Water, for example, can be formed as follows: 

2H2 + O2 --> 2H2O 

Here you have 4 Hydrogens and 2 Oxygens on the left and the same on the right. Thus, even though the hydrogen atoms and oxygen atoms have been rearranged (i.e. they "came together" to form water), mass is still conserved. 

Answer 2

Answer:

★Answer → The total mass of the products of a reaction is equal to the total mass of the reactants.