Step 1: CH4(g) + Cl2(g)  <--> CH3(g) + HCl(g) + Cl          slow Step 2:  CH3(g) +  Cl2(g) --> CH3Cl(g) + Cl                        fast   A. What is the overall reaction  and rate expression for the appearance of CH3Cl (g) ? B. Use the answer in part a to write the rate expression for the change in concentration of CH3(g). C. Using the steady state approximation, give an expression for the appearance of CH3Cl(g) that does not depend on the concentration of CH

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