Platinum (Pt), with a mass number of 190 and an atomic number of 78, decays by emission of an alpha particle.?
2.)a,What is the volume percent of a solution prepared by dissolving 21 g of NaOH in enough water to make a final volume of 120 mL? Show your work.
b, How many mL of a 10% solution can be made from the solution in part a? Show your work.