0) 2/2872016 11500 PM 4 69.6/100 3 272812016 06:03 PM ASSig Availabl Due Dat Lat

Question

0) 2/2872016 11500 PM 4 69.6/100 3 272812016 06:03 PM ASSig Availabl Due Dat Late sub Score Print Calulator Periodic Table Using the following data, Compound | Melting point () | Ann (kJimol) | Boiling point () | -(kJmol) HF HCI HBr HI -83.11 -114.3 -86.96 5091 4.577 1.991 2.406 2.871 19.54 -84.9 67.0 35.38 25.18 7.53 19.27 21.16 Points P Grade C Descript Policies: 100 100 You can calculate ASus and AS for HF You can up on an Number Number AS24.1 /K mol J/K- mo You have You lose in your q ansv e Determine the entropy change when 6.00 mol of HF boils at atmospheric pressure Incorrect The value of ASp above is for 1.00 mol of Number AS-867.6 KHF. You need to scale that value up for 6.00 O Help V of mol of HF. Also, consider the answer. Does decrease in entropy sign of your result in an increase or

Explanation / Answer

Hvap = 25.18 kJ/mol = 25180 J/mol
Tvap = 19.54 °C
Mr = 20 g/mol
n = 6.0 mol

S = n X Hvap/Tvap
S = 6.0 X 25180/(273 + 19.54) = 6.0 X 25180/(292.54)
S = 516.44 J/K

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