50.0 grams of KCl is dissolved in water to make a 4.00 L
solution. What is the molarity of the solution? (Molar mass of
KCl = 74.5 g/mol) ___ M ( Round your answer to the
appropriate number of four significant figures)

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