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

Answer 1

Answer: C. 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: According to law of conservation of mass, the mass can neither be created nor be destroyed. Thus the mass of products must be equal to the mass of reactants.

In order to have same mass on both sides of the chemical equation, the number of atoms of each element must be same in reactants as well as products. Thus all the chemical equations are balanced.

`2H_2+O_2\rightarrow 2H_2O`

4 grams of hydrogen combine with 32 g of oxygen to form 36 g of water. Thus the mass remains conserved.

Answer 2

The answer is C. Hoped that helped :)