What is the molarity of 3.0 L solution containing 250 g of Nal​

Flourine is found to undergo 10% radioactivity decay in 366 minutes determine its halflife

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

Which factor is likely to impact the possible number of compounds? presence of unlimited number of elements in the periodic table the inability of atoms to align perfectly with other atoms the ability of all elements to react with every other element all elements being equally reactive