4) How many atoms are present in a sample of oxygen, O2 with 12.222 moles?

This drawing shows a human body system. what is the primary function of this body system?

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?

What substance has a mass of 9.5g and volume of 2.1cm^3