A new element, X, is discovered and is found to have 3 isotopes: X-130, X-132, and X-134. 50% of all atoms of element X are X-130; 40% are X-132; and the remaining 10% are X-134. What is the atomic mass of this new element? (Enter the number only and keep 1 decimal, as in 000.0 )

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 neutrons does an element have if its atomic number is 50 and its mass number is 166

Molecular iodine, i2(g), dissociates into iodine atoms at 625 k with a first-order rate constant of 0.271 s−1. part a part complete what is the half-life for this reaction?