Chapter 3, Problem 3STP

Interpretation Introduction

Interpretation:

Law that describes that the ratio of masses of two elements remains the same in the closed container is to be determined.

Concept introduction:

The mass of the reactant and product remains the same at the end of the reaction is the law of conservation of mass.

Answer to Problem 3STP

Correct Answer: The correct option is (c).

Explanation of Solution

Reason for correct option: In a close container the ratio of the masses remains the same as the starting of the reaction and at the end of the reaction. There is only a rearrangement of atoms, and the mass does not change in a chemical reaction. This law is known as conservation of mass.

Hence, this is a correct option.

Conclusion

Reasons for incorrect options:

Option (a) According to the law of definite proportions, every single chemical compound contains (or comprises) fixed plus constant proportions (by a mass) of its constituent elements. Hence, this is an incorrect option.

Option (b) According to the law of multiple proportions, the compositions of $\text{2}$ compounds composed of same elements. Hence, this is an incorrect option. Hence, this is an incorrect option.

Option (d) According to the conservation of energy, energy can’t be created and also not be destroyed; it can only convert from one form of energy to another form. Hence, this is an incorrect option.