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01/10/2021 12:43 pm
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The molar entropies of HI (g) and I (g) at 298 K are 206.5, 114.6, and 180.7 J mol-1 K-1 respectively. Using the ΔG° given Below, calculate the bond energy of HI.
HI(g) → H(g) + I(g); ΔG° = 271.8 kJ
(a) 282.4 kJ mol-1
(b) 298.3 kJ mol-1
(c) 290.1 kJ mol-1
(d) 315.4 kJ mol-1
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01/10/2021 12:46 pm
Correct answer: (b) 298.3 kJ mol-1
Explanation:
ΔS° = – 206.5 + 114.6 + 180.7 = 88.8
ΔG° = ΔH° – TΔS°
ΔH° = 271.8 + 298 × 88.8 x 10-3
ΔH° = 298.3 kJ mol-1