ncovites and Due Dates Chapte 8/2017 08:00 AM35/100 () 11/27/2017 02:14 PM - -4

Question

ncovites and Due Dates Chapte 8/2017 08:00 AM35/100 () 11/27/2017 02:14 PM - -4 Periodic Table 5 of 25 eral Chemistry 4th Edition Print Calculator University Science Books presented by Sapling Learning Using the following data, Compound | Melting point (C) |us (kJhnol) | Bolling point (0 | (kirno!) HF HCI HBr Hil 83.11 -114.3 86.96 -50.91 4.577 1.991 2.406 -67.0 2.871 25.18 17.53 19.27 21.16 19.54 -84.9 -35.38 calculate AStus and ASvap for HBr. Number Number J/ (K mol J/ (K mol Determine the entropy change when 3.50 mol of HBr() boils at atmospheric pressure. Number J/K O Previous ) Give Up & View SoLion check Answer Next Hint

Explanation / Answer

part1)

calculation of delta S fusion of HBr

we know

delta S fustion = delta H fusion / melting point

delta H fusion of HBr = 2.406 kJ/mol

and melting point = -86.76 C = -86.76 + 273.15 = 186.19K

Thus delta S fusion = 2.406x1000 J /mol / 186.19 K

= 12.92 J/K.mol

Part 2)

delta S vap

similarly delta S vap = delta h vap / boiling point

= 19.27x1000J/mol / 206.15 K

= 93.47 J/K.mol

Part C

Delta S for boiling of 3.5mol of HBr

to boil 1 mol of HBr delta s = 93.47 J/K.Mol

thus for 3.5 mol delta S = 3.5 mol x93.47 J/K.Mol

= 327.164 J/K

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