Which of the following statements concerning entropy is/are true? On a per mole

Question

Which of the following statements concerning entropy is/are true? On a per mole basis, the solid form of a particular substance has a greater entropy than its gaseous form. On a per mole basis at a fixed temperature, larger gaseous molecules tend to have a greater entropy than smaller gaseous molecules because of a greater number of comformations over which to disperse energy. On a per mole basis, the liquid form of a particular substance has a greater entropy than the solid form of the substance. (a) 1 only (b) 2 only (c) 3 only (d) 1 and 2 Which of the following is true for the sublimation of a solid substance? (a) delta S = 0 and delta H = 0. (b) delta S > 0 and delta H > 0. (c) delta S 0. (d) delta S

Explanation / Answer

2) all the phase transformations process like fusion, vaporization, and sublimation are endothermic in nature..For phase transformation of sublimation So delta H is positive, and the entropy increases as the phase changes from solid to gas as the disordernesss among the molecules increases, delta S > 0

so option b is the correct answer

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