Question

Cyngor C OWIODIS OCION In each case, he fills a reaction vessel with some mixture of the reactants and products at a constant temperature of 78.0 °C and constant total pressure. Then, he measures the reaction enthalpy AH and reaction entropy AS of the first reaction, and the reaction enthalpy AH and reaction free energy AG of the second reaction. The results of his measurements are shown in the table. Complete the table. That is, calculate AG for the first reaction and AS for the second. (Round your answer to zero decimal places.) Then, decide whether, under the conditions the engineer has set up, the reaction is spontaneous, the reverse reaction is spontaneous, or neither forward nor reverse reaction is spontaneous because the system is at equilibrium AH18 AS 630 x 3 ? AG = IN 2NH, 6) - N,H.6) + H, () Which is spontaneous? this reaction the reverse reaction nether AN 439 AS-D ACON 411,PO,0) -- P06) + 6H,000 Which is spontaneous? this reaction the reverse reaction Explanation . Check

Answer 1

Answer > The reaction vessel with some mixture Of the reactants and product at constant temperature of 78.6°C and constant total pressure Therfore reaction is Isothermal and ..Isobaric in nature because ATEO and 2NH3(g) → Na Hacg) + H2 (9) . For given reaction . AH=188 kg - 188*103 ].. AS : 620 /K T:s 78°C = 78 +273 = 351 K From Gibbs energy equation AG: AH-TAS = (188000 1) - (3 SLK X6 20 / K - (188600 ]) - ( 2176203) : - - 29620 ] . - 29.620 K] Note: i. IF AG is negative the reaction is spontaneous in forward direction 1116 AG is zero the reaction is at equilibriunt iii. LF OG is positive the reaction in the forward direction

JUIL. → Therforegiven reaction 2NH3(g) N2H4g) + HAC) is spontaneous in forward direction : 2. 4 H3PO4 Cs) - P4010 ) + 6H2O(l) for given reaction, AH = 439 k] = 439 x103 ] OG- Ok] AS = ? T = 78°C - 78 +273 = 351 K From Gibbs egergy equation AGAH-TAS O=(439 x1037) - (351K KAS) 439000 J = (351 K) XAS As = 439000 351 AS 12 50.712 /k > Since reaction AG=0 is al , Therfore the given equilibrium
Change in free energy for the reaction (1) is -29.620KJ ,Therefore given reaction is spontaneous in forward direction.

For reaction (2) change in entropy is 1250.712J/K and change in gibbs energy is zero.Therfore reaction is at equilibrium