What describes a change that occurs when one substance reacts to another substance?

Determine the empirical formula of a compound containing 40.6 grams of carbon, 5.1 grams of hydrogen, and 54.2 grams of oxygen. in an experiment, the molar mass of the compound was determined to be 118.084 g/mol. what is the molecular formula of the compound? for both questions, show your work or explain how you determined the formulas by giving specific values used in calculations.

Name the element in group 17, period 2. (periodic table)

Is 9 correct? and can someone me with 10? it’s due tomorrow, you