Naturally occurring element X exists in three isotopic forms: X-28 (27.979 u, 77.11% abundance), X-29 (28.976 u, 8.00% abundance), and X-30 (29.974 u, 14.89% abundance). Calculate the atomic weight of X.

Which produce would best increase the amount of heat energy that is actually gained by calorimeter b

Arecipe calls for 1.2 cups of oil. how many liters of oil is this?

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.