What is the hydroxide concentration of a solution with a ph of 12.80?

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? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Find the mass, in grams, of 5.00*10^23 molecules of f2