Consider the following multistep word problem: The sum of the ages of a brother and sister is 28. If four times the brother's age is subtracted from three times the sister's age, the difference is 21.
Consider just the first sentence of this multistep word problem.
Sentence 1: The sum of the ages of a brother and sister is 28.
Give an equation that represents this statement using b as the age of the brother and s as the age of the sister.
Express your answer in terms of the symbols b and s.

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.