Which of the following correctly identifies the element with the lower rst ionization energy provides the best justification?
Choose 1
Kr, because of its lower nuclear charge
Kr, because of its smaller valence orbitals
Xe, because of its larger atomic radius
Xe, because of its completely filled valence shell

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.