P+o2=p2o5 how do i balance this chemical equation

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution?

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Identify the electromagnets with poles that are reversed from the electromagnet shown above