At a certain temperature this reaction follows second-order kinetics with a rate constant of 7.78 M-1s-1
ClCH2CH2Cl (g) --> CH2CHCl (g) + HCl (g)
Suppose a vessel contains ClCH2CH2Cl at a concentration 1.30 M.
Calculate the concentration of ClCH2CH2Cl in the vessel 0.800 seconds later. you may assume no other reaction is important. Round to two sig figs