Which of the following graphs correctly represents the variation of thermodynamic properties of Haber's process?

Solution & Explanation

### Related Formula Delta G^circ = Delta H^circ - TDelta S^circ ln K_texteq = -fracDelta G^circRT = -fracDelta H^circRT + fracDelta S^circR ### Core Logic Let us state Haber's process reaction: mathrmN_2(g) + 3H_2(g) rightarrow 2NH_3(g) This synthesis reaction is thermodynamically characterized by: 1. **Delta H^circ < 0** (Exothermic reaction) 2. **Delta S^circ < 0** (Decrease in the number of gaseous molecules, from 4 moles to 2 moles) Both Delta H^circ and Delta S^circ remain relatively constant across the temperature range of interest. mathrmN_2(mathrmg) + 3mathrmH_2(mathrmg) rightarrow 2mathrmNH_3 DeltamathrmH^circ = -textve DeltamathrmS^circ = -textve (As gaseous moles decreases). (1) As temperature increases frac-DeltamathrmH^circ_mathrmRmathrmT , decreases (2) DeltamathrmG^circ = -mathrmRT ln mathrmK_mathrmeq mathrmR ln mathrmK_mathrmeq = -fracDeltamathrmG^circmathrmT (on increasing temperature in exothermic reaction mathrmK_mathrmeq decreases) DeltamathrmH^circ and DeltamathrmS^circ are almost constant with temperature. This perfectly matches Graph (1). ### Pattern Recognition Since Haber's process is exothermic, K_texteq must decrease as temperature increases (according to Le Chatelier's Principle). Because R ln K_texteq = -Delta G^circ/T, the quantity -Delta G^circ/T must also decrease with temperature. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Equilibrium Class 11 Chemistry: Chemical Thermodynamics

More Equilibrium Previous-Year Questions — Page 6

Q62 jee_main_2024_31_jan_morning Equilibrium Constant
For the given reaction, choose the correct expression of K_C from the following :- Fe_(aq)^3+ + SCN_(aq)^- rightleftharpoons (FeSCN)_(aq)^2+
  • A. K_C = frac[FeSCN^2+][Fe^3+][SCN^-]
  • B. K_C = frac[Fe^3+][SCN^-][FeSCN^2+]
  • C. K_C = frac[FeSCN^2+][Fe^3+]^2[SCN^-]^2
  • D. K_C = frac[FeSCN^2+]^2[Fe^3+][SCN^-]

Solution

### Related Formula K_C = frac[textProducts][textReactants] ### Core Logic K_C = fractextProducts ion conc.textReactants ion conc. K_C = frac[FeSCN^2+][Fe^3+][SCN^-] ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 11 Chemistry: Equilibrium
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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)