Molecular iodine, I2(g), dissociates into iodine atoms at 625 K with a first-order rate constant of 0.271 s−1 . If you start with 0.040 M of I2 at this temperature, how much will remain after 7.68 s assuming that the iodine atoms do not recombine to form I2?
Express the molarity to two significant figures.

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.

How many grams of aluminum will there be in 98g of al2o3?

Ineed this asap part i: scientific method what is the difference between science and pseudoscience? what is the scientific method?