Help.. Describe how to prepare 200 μlof a 25 mg / mlampicillin solution from 3 ml of a stock solution of 100 mg / ml.

What is the number of moles in 15.0 g ash3?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of 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.