IIT JAMChemistryChemical ThermodynamicsNumerical+2 / −0
The heat of formation of MgO at 300 K and 1 bar pressure is –600.60 kJ mol⁻¹. The free energy (in kJ mol⁻¹) of formation of MgO at 280 K is (Round off to nearest integer)
Given: In the range 280-300 K, the constant pressure heat capacities (C_P) and molar entropies (S_m) are:
| | Mg | O₂ | MgO |
| --- | --- | --- | --- |
| C_P (in J mol⁻¹ K⁻¹) | 24.9 | 29.4 | 27.0 |
| S_m (in J mol⁻¹ K⁻¹) | 0 | 205.2 | 0 |
Numerical answer
View written solutionFree
Correct answer: -574, -570
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