How do i complete and balance the reaction hc2h3o2+ba(oh)2

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

How many moles of oxygen gas are produced from the decomposition of six moles of potassium chlorate

How does science use models to gain a better understanding of concepts?