n=cv (In datasheet so no need to worry about remembering). Thats probably the most important formula in molarity. You also have the c1v1=c2v2, but this is only used in dilution. You also have the other measurements of concentration like w/w%, v/w%, ppm and like 2 more I think, but they are just different ways of saying the same thing, just more usefull depending on the situation