Which of the following best describes the energy involved in an exothermic chemical reaction before the reaction? (pick only one answer choice! ) a. the energy was stored in chemical bonds. b. the energy was created during the reaction. c. the energy was available in the environment. d. the energy was destroyed immediately during the reaction. *i'm sure that b. and d. are incorrect since energy can neither be created nor destroyed.*

Steam reforming of methane ( ch4) produces "synthesis gas," a mixture of carbon monoxide gas and hydrogen gas, which is the starting point for many important industrial chemical syntheses. an industrial chemist studying this reaction fills a 1.5 l flask with 3.5 atm of methane gas and 1.3 atm of water vapor at 43.0°c. he then raises the temperature, and when the mixture has come to equilibrium measures the partial pressure of carbon monoxide gas to be 1 .0 atm. calculate the pressure equilibrium constant for the steam reforming of methane at the final temperature of the mixture. round your answer to 2 significant digits.