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For the ammonia synthesis reaction, the standard enthalpy change is…
Question
For the ammonia synthesis reaction, the standard enthalpy change is -92.4 kJ and the standard entropy change is -198.3 J/K, both assumed temperature independent. Calculate the standard Gibbs free energy change at 500 K in kJ, rounded to 3 decimal places.
✓ Verified answer: 6.75checked by our engine — not a guess
Step-by-step solution
dG = dH - T*dS = -92400 - 500*(-198.3) = -92400 + 99150 = 6750 J = 6.75 kJ.
The positive value shows the reaction becomes non-spontaneous at 500 K.
Final answer6.75
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