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Change in volume from 1 mole of graphite to 1 mole of diamond. ΔV = 12/3.31 − 12/2.25 = −1.71 cm³. Gibb's free energy is the measure of useful work done at constant temperature and pressure. ΔG = −PΔV.
- ΔG = −1895 J
- ΔG = −1.1 × 10⁹ Pa
- ΔG = −1.71 × 10⁻⁶ m³
- ΔG = −1.71 × 10⁻⁶ cm³
Correct answer: ΔG = −1895 J
Solution
The formula ΔG = −PΔV is used, where ΔV = −1.71 cm³ = −1.71 × 10⁻⁶ m³. Assuming standard pressure P = 1 atm = 101325 Pa, ΔG = −101325 × (−1.71 × 10⁻⁶) = −1895 J.
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