Here we assume that the hydrogenation of C,H, to CH, goes through the mechanism: (1) CH * +2 (2) CH + H. * (3) CH3 + H (4) H+2* CH *+H* >2CH3* CH4 +2* >2H* Where step 2 is rate limiting (RLS) and steps 1, 3, and 4 are in quasi equilibrium (Q). (a) Write an equation for the rate of step 2. (b) In the quasi-equilibrium limit the following expression are obtained: (1) 0 (2) 8 CH, CH, = KP 02 8 H 02 = CH H (3)e = K Pe H Mention some critical phenomena, which canot studied under the above assumption. (c) Write an expression for the rate and show that, in the limit where the coverage of C H and CH;*" are remote, that it can be written as: