If you have 3.8 grams of nacl, how many moles of nacl do you have?

Use this information to determine the number of calends electrons in the atoms. which of the following correctly compares the stability of the two atoms? a) both are unreactive b) both are highly reactive c) a is unreactive and d is reactive d) a is reactive and d is unreactive

What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-

Stoichiometry- i need with 14 and 15! an explanation would be appreciated!