Question

CO2 can be eliminated and transformed to fuel like CH4 by the following reaction: CO2(g) + 4H2(g) → 2H2O(g) + CHale) Figure below shows 1 mol of CO2 entering at 800 K and reacting with 4 mol of Hz entering at 298 K while the product exits the reactor at 1000 K. 1 mol CO2 800 K Product 1000 K Reactor 4 mol H2 298 K Determine the heat transfer, Q for this process if only 70% conversion of CO2 is achieved.

Answer 1

To answer this tion. We need questo enthalpies of elements and compounds at given temperatures. co + 4H 2HO + CH 2 2 Ho (g) 4 (g) Enthalpy of Co, at 8ook 22.8 KJ mol Enthalpy of u at at 298k 0 (since it is element tal state at stp ). at 10ook 1 20.3 kJ/mol Enthalpy of to at 1000K 25.9 kJ mol Enthalpy of at CH 4 1000k -36.35 KJ mol Enthalpy of co at 1oook 33. .4 kJ mol 70-4 Conversion СО + 4 H 2 LHO (g) + 2 CH 4 (g) tro I mol 4 mol 0 After conversion 0.3 mol 1.2 mol 1-4 mol 6-7 mol

Heat transfer Q Euthat pies of Output - Euthalpies of input. = 0.3 mol хан, ) t 1.2 molt (AHA) 4 H at loook 2 at 298k 1.4 molx H + 0.7 molx (44. + H₂ CH 4 R Im A nol X (4H_) + 4 moly (446) coat 800k tIH. at 2 10ook 20.3 kJ mo1 z 0-3x 33 4 KJ + 1-210 25.9 KJ اكر mol + 1.4 X mpol my + olx - 36.35 kJ - ( i mop x 22.8 kJ mol ma moi 0 - 4 mol x 3 KJ 2013 mol +184664615 22.395 kJ Heat transfer Q 22.395 kJ