By mass, a compound contains 39.7% C, 1.7% H, and 58.7% Cl, and has a molar mass of 181.5 grams. Determine the molecular formula of the compound.

If you chip a tooth, most likely you will go to the dentist to have the missing material filled in. currently the material used to fill in teeth is a polymer that is flexible when put in, yet is hardened to the strength of a tooth after irradiation with blue light at a wavelength of 461 nm. what is the energy in joules for a photon of light at this wavelength?