(ina vessela C.Calculate the partial pressure of e four gases v Pu.,atm Pco.,atm Pco,atm PH.o,atm nitial 0.5 0.5 0 Change Equilibrium 0.5-x 0.5-x At equilibrium,K PcoP:O =0.771 PH,Pco: (x(x) (0.5-x)0.5-x) =0.771 05-x=077=0.878 X X=0.878(0.5-X) x=0.439-0.878x 1.878x=0.439 x=0.234 Thus. P4,=Po,=0.5-x=0.5-0.234=0.266atm Pco PH:o =x=0.234atm Part C.Answer any three of the six questions.If you answer more than three,the best three will be used to calculate your mark(20 marks each). 1 Fuel cells for cars will likely use hydrogen as the fuel and oxygen as the oxidant.Using the following data: 2H+2e→Hg E0=0000V 02g+4Hem+4e→2H0 E°=1.229V (a)Write the balanced overall electrochemical reaction and calculate the standard cell potential O2g+4H(ea+4e→2H0d E=1.229V 2H2e→4Haa+4e E°=0.000V O2e+2H2g→2H2O0 E°=1.229V (b)Calculate the cell potential at 50C when P=3.00 atm and Po=1.30 atm E-E_RTIn(Q) nF 2 2 (b) 0.5 atm of H2(g) and 0.5 atm of CO2(g) are placed in a vessel at 25o C. Calculate the partial pressure of each of the four gases when equilibrium is attained. H2 p ,atm CO2 p ,atm CO p ,atm H O2 p ,atm Initial 0.5 0.5 0 0 Change -x -x +x +x Equilibrium 0.5 - x 0.5 - x x x At equilibrium, 2 2 2 CO H O p H CO p p K 0.771 p p = = 1/2 (x)(x) 0.771 (0.5 x)(0.5 x) x (0.771) 0.878 0.5 x x 0.878(0.5 x) x 0.439 0.878 x 1.878 x 0.439 x 0.234 = − − = = − = − = − = = Thus, 2 2 2 H CO CO H O p p 0.5 x 0.5 0.234 0.266atm p p x 0.234atm = = −= − = = == Part C. Answer any three of the six questions. If you answer more than three, the best three will be used to calculate your mark (20 marks each). 1. Fuel cells for cars will likely use hydrogen as the fuel and oxygen as the oxidant. Using the following data: 2 H+ (aq) + 2 e− → H2(g) Eo = 0.000 V O2(g) + 4 H+ (aq) + 4 e− → 2 H2O(l) Eo = 1.229 V (a) Write the balanced overall electrochemical reaction and calculate the standard cell potential. O2(g) + 4 H+ (aq) + 4 e- → 2 H2O(l) Eo = 1.229 V 2 H2(g) → 4 H+ (aq) + 4 e- Eo = 0.000 V _______________________________________________ O2(g) + 2 H2(g) → 2 H2O(l) Eo = 1.229 V (b) Calculate the cell potential at 50o C when H2(g) p 3. = 00 atm and O2(g) p 1. = 30 atm 0 RT E E ln(Q) nF = −