How do you know if a chemical change has taken place?

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.

Word equation for k+ h2o yield koh + h2

The atomic number, or number, is the described as the number of in the nucleus of an chemical element.