What mass of water would remain if a 38.4gram sample of hydrogen peroxide totally decomposed

Asample of silver (with work function ? = 4.52 ev) is exposed to an ultraviolet light source (? = 200 nm), which results in the ejection of photoelectrons. what changes will be observed if: silver is replaced with copper (? = 5.10 ev) more photoelectrons ejected no photoelectrons are emitted fewer photoelectrons ejected more energetic photoelectrons (on average) less energetic photoelectrons (on average)

What is the mass of phosphorous in a 51-kg person

How many peaks will be present in a mass spectrum for brcl?