Question

7. Use the following thermochemical data to identify which statement is true pertaining to the reaction Fe,O,(s) + 3H2(g) à 2Fe(s) + 3H,O(g) AH(Feq (ə)) = -822 kJ mol AH(H0(9) --242 kJ mol 56.96 -0.090 kJ moi"! K S.= 0.131 kJ mollk! SPO = 0.027 kJ mol'k 54,00) -0.189 kJ mol-'k A The reaction is thermodynamically favourable at 20°C. B The standard enthalpy of the reaction is -96 kJ molt C The Gibbs energy change for the reaction at 500 °C is -10.7 kJ mol', provided the data given are thermally invariant. D. The reaction is thermodynamically unflavoured at 500 °C. E The standard entropy change for the reaction is -138 J mol' K".

Answer 1

Fe₂O₃ + 3H 2Fe + 3H₂O standard enthalpy of the reaction is DH = 3 C Alche +2 (DH (Ee) -3 (DH (H2) - (OM (reson) we know that, DHE CE), DH (143) = 0 - DH= 3x -242-(-822) = 96 kJ/mol 05= 3(5.,69) +265c.)-3(5.) - see = 3x 0-189 + 2x 0.027 - 3x 0-131-0.09 - 0-138 SG at 200 is since I DG at SG 5000 DG = DH-TXAS = 96- (273+20) x 0-138 = 55 566 kJ/mol positive the reaction is anfavourable DG = 96-(2734500) x 0138 = -10674 KJ/mol negative the reaction is favourable since sG is