Question

1.which statement is a correct expression of the law of conservation of mass?

Answer 1

Solution:

The law of conservation of mass states that mass in an isolated system is neither created nor destroyed by chemical reactions or physical transformations.

o According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants.

o The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.

Thus the required right answer is B.