How many moles (of molecules or formula units) are in each sample? 23.1 kg Fe (NO3) 2
Express your answer to three significant figures.

nFe(NO3)2 =mol

the answer would be a

it's c. elements are placed in rows based on how may valencies electrons have.

because of all the things that happen around the us, many people get into arguments which sadly could get physical, but we should actually make a change for that.