What is the correct empirical formula for C18H306?

Which best describes how johannes kepler developed his laws of planetary motion

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

Nan element’s square on the periodic table, the number with the greatest numerical value represents the