How many moles of argon are in 28.8 g of argon?

28.8 g = mol

Asingle atom of an element has 21 neutrons, 20 electrons, and 20 protons. which element is it? ok o z

H2so4(aq) + mg(s)—> mgso4(aq) +h2(g) which substance is the acid in the reaction?

Answer asap : ( a. how does mucus prevent the entry of pathogens? b. describe two ways white blood cells protect us from pathogens.