When drawing a Lewis structure for a molecule how do you know what symbol at the center of the structure Any element's symbol in the chemical formula can be placed at the center of the Lewis structure

The element there is more than one of in the formula is usually placed at the center of the Lewis structure.

The element there is only one of in the formula is usually placed at the center of the Lewis structure.

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.