Iron(ii) chloride is formed from the reaction between iron and copper(ii) chloride.

Which one of the following gases is not an important component of soil?

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)

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.