Help!!! Please quick!

If the atomic mass of an atom is 34 and the atom contains 13 protons, how many neutrons does the atom contain?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices