If 7.3x10^23 atoms of magnesium react with excess iron (III) chloride, how many moles of magnesium chloride will be produced? Round to 2 decimal places

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)

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

Which material burns faster? metal aluminum