At a certain temperature the rate of this reaction is first order in CICH₂CH₂CI with a rate constant of 1.31 ¹ CICH₂CH₂CI (g) → CH₂CHCI (g) + HCI (g) Suppose a vessel contains CICH₂CH₂CI at a concentration of 0.220M. Calculate the concentration of CICH₂CH₂CI in the vessel 0.840 seconds later. You may assume no other reaction is important. Round your answer to 2 significant digits. M X ? Ar

Fig: 1