How many moles of tungsten atoms are in 4.816 x 1025 atoms of tungsten?

If 90.0 grams of ethane reacted with excess chlorine,how many grams of dicarbon hexachloride would form

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?

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?