6) Bromine (Br2) has a heat of vaporization of 29.96 k/mol at its boiling point

Question

6) Bromine (Br2) has a heat of vaporization of 29.96 k/mol at its boiling point of 58.8 C and a heat of fusion of 10.57 kKJ/mol at its freezing point of -7.2 C. Determine the reversible entropy change for the two processes. (1pts each) 7) Using the thermodynamics Tables in the appendix of your textbook determine the AS of the following reactions. (2 pts Each) 7a) 7b) Fe Os(s) +3 CO(9) 3 CO9) + 2 Fe(s) 8) Elemental boron can be formed by reaction of boron tichloride with hydrogen. Using the equation and data 161.a/K mol Substance UK mol) +130.6 2BClg)+3H-(g) 2B(s)+ 6Hg) B(S) +5.9 +186.8

Explanation / Answer

Ans 6

Heat of vaporization Hvap = 29.96 kJ/mol x 1000J/kJ

= 29960 J/mol

Boiling point Tb = 58.8 + 273 = 331.8 K

Entropy change of vaporization

Svap = Hvap/Tb

= (29960 J/mol) / (331.8 K)

= 90.295 J/mol·K

Heat of fusion Hfus = 10.57 kJ/mol x 1000J/kJ

= 10570 J/mol

Melting point Tf = -7.2 + 273 = 265.8 K

Entropy change of fusion

Sfus = Hfus/Tf

= (10570 J/mol) / (265.8 K)

= 39.767 J/mol·K

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