Calculate the change in entropy of the surroundings

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(I) Given the data below, determine which allotrope is the more ordered form and predict the sign of ΔS for each transition: (a) white tin changes into gray tin at 25°C; (b) diamond changes into graphite at 25°C. 

Sm° J/molK

gray 44. 14

white 51.55

graphite 5.7

diamond 2.4 

(II) Arrange the following reaction equations according to increasing ?delta? S°rxn values and explain your answer. 

i. C2H4 (g) + 3O2 (g) → 2CO2 (g) + 2H2O (g)

ii. PCl5 (g) → PCl3 (g) + Cl2 (g)

iii. Na (s) + O2 (g) → NaO2 (s)

iv. 2C4H10 (g) + 13O2 (g) → 8CO2 (g) + 10H2O

(III)  Calculate the change in entropy of the surroundings when water freezes at -10.°C; use ?delta?Hfus (H2O) = 6.0 kJ/mol at -10.°C.

Reference no: EM132403614

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