How many moles of carbon tetrabromide are present in 5. 27x10`22 molecules of the compound

Gymnast always perform on padded mats. how does the mats protect the gymnast

What happens to isotopes that are unstable?

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?