A chemist prepares a solution of potassium permanganate by measuring out of potassium permanganate into a volumetric flask and filling the flask to the mark with water. Calculate the concentration in of the chemist's potassium permanganate solution. Be sure your answer has the correct number of significant digits

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ