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12 Dec 2019

A chemist found a discrepancy between the third law entropy and the calculated entropy from statistical thermodynamics for a compound. (a) which value is larger? (b) suggest two reasons

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Sixta Kovacek
Sixta KovacekLv2
13 Dec 2019

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Part A) The third law of thermodynamics relates the entropy (randomness) of matter to its absolute temperature. Which of the following statements are in agreement with the third law of thermodynamics? 1.In a gaseous state, the entropy of the system is zero. 2. At the melting point, the entropy of a system increases abruptly as the compound transforms into a liquid. 3.At zero degrees kelvin, substances maximize entropy. 4.At absolute zero, the interatomic distance within a crystal is minimized. 5.In a crystalline state, there is a tendency to minimize entropy. 6.As the temperature of a perfect crystal increases, the random vibrations of the molecules decrease. Part B) Calculate the standard-state entropy for the following reaction: 6 CO2(g) + 6 H2O(l) ⟶ 1 C6H12O6(s) + 6 O2(g) (If applicable, coefficients of one have been included for clarity.) The standard entropy values are given in the table. Formula S∘ J/(K⋠mol) C6H12O6(s) 212, O2(g) 205, CO2(g) 214, H2O(l) 189

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