How many formula units are there in 302.48 grams of zinc chloride?

Where can i find naap lab answers sheet/key?

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?

Chemistry worksheet - i am not sure what they are asking for exactly?