If making 2.5 liters of a 1.5M solution, what volume of a 12.1M stock solution would be needed for the dilution? *
20.17 L
O 7.26 L
309.9 mL
4.24 L
none of the above

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?