Final answer:
Copper and chlorine illustrate the law of multiple proportions by forming two compounds with simple whole number ratios of copper to chlorine.
Step-by-step explanation:
The law of multiple proportions states that when two elements combine to form more than one compound, the mass ratios of one element to the other will be whole numbers in simple ratios.
In the case of copper and chlorine, they can form two compounds with different ratios of copper to chlorine.
For example, one compound may have a ratio of 1 copper atom to 2 chlorine atoms, while another compound may have a ratio of 1 copper atom to 1 chlorine atom.
These ratios of copper to chlorine illustrate the law of multiple proportions because they are simple whole number ratios.