Matter that is composed of two or more different elements chemically combined in a fixed proportion is classified

Calculate the percent composition by mass of each element in al(oh)3. use at least three significant figures.

What is the empirical formula of a compound that is 50.7% antimony and 49.3% selenium ?

The following transition occurs at a molecular level for a substance. what transition corresponds to this change in microscopic structure? the carbon dioxide molecules on the left are in a regular, tightly packed pattern. after heating, it becomes much lower density. a. melting b. boiling c. sublimation d. freezing