At a certain temperature the rate of this reaction is first order in SO₃ with a rate constant of 0.208 s⁻¹:
2SO₃(g) → 2SO₂(g) + O₂(g)

Suppose a vessel contains SO₃ at a concentration of 1.36M.
Calculate the concentration of SO₃ in the vessel 7.30 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits.

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.