A 2.197 g sample of a compound containing only carbon, hydrogen and oxygen is burned in an excess of dioxygen producing 4.197 g CO2 and 2.578 g H20. What is the empirical formula of
the compound?

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.