In order to analyze the waste water containing Co2+ from a manufactur- ing process, 1.0 L of water was evaporated to 10.0 mL and then placed in a spectrophotometer tube. The absorbance was found to be 0.30 A
(63% transmittance), Using your calibration curve, calculate the number
of milligrams of Co2 in 1.0 L of waste water,

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.