What data led to the development of the Law of Multiple Proportions? Give an example and explain why this law is important in chemistry.

Would this be a good answer:
John Dalton used the same observations he used for his law of definite proportions to help develop the law of multiple proportions, in other words, he used masses of samples to help create the law. An example would be CO2 and CO, both made of the same elements yet have different masses. the mass ratio of O2 to C in CO2 is 2.67:1 , but in CO the ratio is 1.33:1. When we divide 2.67 by 1.33 we get 2- meaning that for every 2 O2, there is 1 C atom. This law is important because it helps it helps find the proportions of compounds made with the same of elements.

I think you have written a very good explanation; however, please read over it before you submit it for your class since there are some repeated words (it helps it helps). Also I would place a period after proportions and start a new sentence with In other words, he used .....

Other than what you stated, I feel as if I need something else to answer the first question, such as numbers to help back it up.

You included numbers as an example. Personally, I think another example would be redundant but I don't know that it would do any harm if you think it would help.

Yes, your answer is correct and provides a good explanation. John Dalton's law of multiple proportions was developed based on the same observations he used for the law of definite proportions, which involved the masses of samples. The example you provided, comparing CO2 and CO, demonstrates how the masses of the elements (O and C) in different compounds can have different ratios. In CO2, the mass ratio of O2 to C is 2.67:1, while in CO, the ratio is 1.33:1. When we divide 2.67 by 1.33, we get 2, indicating that for every 2 O2, there is 1 C atom.

The law of multiple proportions is important in chemistry because it helps in determining the proportions of compounds that are composed of the same elements. By understanding the different ratios of elements in compounds, scientists can gain insight into the arrangements of atoms and the bonds between them. This knowledge is crucial for various applications in chemistry, such as predicting and understanding chemical reactions, designing new compounds, and studying the behavior of substances.