You discover a bottle of aqueous sodium chloride of unknown molarity. however, the bottle says that there are 0.75 moles of nacl dissolved and the total volume of the solution is 500.0 ml. what is the molarity of this solution? note which type of calculation you need to perform, and then perform the calculation.

Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. an industrial chemist studying this reaction fills a 25.0l tank with 4.5 mol of sulfur dioxide gas and 4.5 mol of oxygen gas at 30.°c. he then raises the temperature, and when the mixture has come to equilibrium measures the amount of sulfur trioxide gas to be 1.4 mol. calculate the concentration equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. round your answer to 2 significant digits.