Question

under certain conditions, 100 g of copper reacts with 25 g of oxygen to produce a compound. under different conditions, 200 g of copper reacts with 25 g of oxygen to produce a different compound. which law does this example illustrate?

a) law of multiple proportions

b) law of conservation of mass

c) law of conservation of energy

d) law of definite proportions

Explanation:

The law of multiple proportions states that when two elements combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element are in the ratio of small whole - numbers. Here, different masses of copper (100 g and 200 g) react with a fixed mass of oxygen (25 g) to form different compounds, which illustrates the law of multiple proportions. The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The law of conservation of energy states that energy is neither created nor destroyed. The law of definite proportions states that a given compound always contains exactly the same proportion of elements by mass.

Answer:

A. Law of Multiple Proportions