How many moles of phosphorus pentafluoride are present in 103 g of PF5?

What mass of carbon dioxide is produced from the complete combustion of 4.50×10−3 g of methane?

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?

Can someone me with 6 to 10 plz this is for masteries test.