A 250 mL solution of common salt and water was prepared so that the concentration of the solution in terms of mass of volume percentage would be 15%. Calculate the mass of common salt dissolved in water to prepare this solution.

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.

Which of the following describes the entropy change as a solution is made from a liquid and solid

Which best describes eras and periods?