24. Use th e thermodynamic data below to determine the standard free energy chan

Question

24. Use th e thermodynamic data below to determine the standard free energy change G for the following reaction at 25c The standard molar entropies of these substances at 25 "C are as follows: CO2(g) S.= 213.6 J/K .2 Svrr a) b) -160 kJ d) 226 kJ ANSWEE IS E. PLEASE ANswer is E. PLEASE +3830 kJ -25. Urea (NH2CONH2), an important nitrogen fertilizer, is produced industrially by the reaction 2NH,(g) + CO2(g) NHCONH2(aq) + H2O(1) dG·=-13.6 kJ at 25°C What is the value of AG at 25'C for this reaction under the following set of conditions? ANSWER IS P. PLEASE 25.0 atm NHs(8) 0.500 atm CO g) 1.00 M NH:CONH2 a) b) 0.63 k d) 27.8 k 14.2 k e) 20.0 k -18.1 k

Explanation / Answer

24)

CaO(s) + CO2 (g) -----> CaCO3 (s) ; dH = -178.7kJ

dS rxn = dS products - dS reactants

dS rxn = dS CaCO3 - (dS CaO + dS CO2)

dS rxn = 92.9 - (39.7 + 213 .6)

dS rxn = -160.4 J/K

dG rxn = dH rxn - T dS rxn

dG rxn = -178.7*10^3 - (25+273.15)*(-160.4)

dG rxn = -130876 J

dG rxn = -131 kJ

Avswer : e

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