Question

Which of the following is true about the mass of the reactants in a chemical reaction? A. The total mass of the reactants in a chemical reaction will be significantly more than the total mass of the products. B. The total mass of the reactants in a chemical reaction will never be equal to the total mass of the products. C. The total mass of the reactants in a chemical reaction will be significantly less than the total mass of the products. D. The total mass of the reactants in a chemical reaction is conserved and will be equal to the total original mass of the products.

Answer 1

Answer: The total mass of the reactants in a chemical reaction is conserved and will be equal to the total original mass of the products.

Explanation:

Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.  

This also means that total mass on the reactant side must be equal to the total mass on the product side

Every balanced chemical equation follows law of conservation of mass.

For Example:  Formation of water follows the equation:

$2H_2+O_2\rightarrow 2H_2O$

Total mass on reactant side = $[2(2\times 1)+(2\times 16)]=36g/mol$

Total mass on product side = $[2((2\times 1)+16)]=36g/mol$

Hence, the total mass of the reactants in a chemical reaction is conserved and will be equal to the total original mass of the products.

Answer 2

The answer is D because matter can not be created or destroyed