Question

The Ostwald process for the commercial production of nitric acid from ammonia and oxygen involves the steps in the table below. (a) Use the values of AHfº in Appendix 4 to calculate the value of AHO for each of the following reactions. Reaction AH 4 NH3(g) + 5 02(9) ► 4 NO(g) + 6 H20(9) 2 NO(g) + O2(g) +2 NO2(9) 3 NO2(g) + H20(1) - 2 HNO3(aq) + NO(g) (b) Write the overall equation for the production of nitric acid by the Ostwald process by combining the preceding and any other necessary equations. (NO (g) and water (g) are also products of the overall reaction. Use the lowest possible whole number coefficients. Include states-of-matter under SATP conditions in your answer.)

Answer 1

a); 4 NH3(g) +502014 NO(g) +GHOGS altren= -905.88 kJ - Han= AHf products - Alf reactants - {tex 90129)+(6x -241-87] -[(**-*594) + (5x0] =-905.88 KT H 2010 (9) +0,6) -->2N02G) Atfren = -114.38 kJ stren = {(2x 33.1032-f02896.29) +6013 = -114138 ks idi) 3 N920+ How->2 HNO3 kq) + NO (9) Stian = |(90.29)+(28-2017.w3]–[8* 33:10)+(-285:83)] 5-137.98 ks b) overall equation 4 NH3(g) +5026) ANO (g) + 6H0 (8) SNO(g) + O2(g) → XN02 (8) ENQ (0) + HOU) → 2 HNOCaq) + NO (9) 4 NH3(g) + 602 g) + NO 2 (g) + Hold) 2 HNO3(aq) + 300 g + 6H (9)