The heat of vaporization of benzene (C6H6) is 30.77 kJ/mol at it's boiling point (80 C). As a liquid, it has a heat capacity of 134.8 J/mol*K, and as a gas it has a heat capacity of 82.4 J/mol*K. Calculate the enthalpy change of heating 245g of benzene from 50 C to 100 C.
moles of benzene = 245 / 78 = 3.141
50oC --------------------> 80oC ----------------------> 100oC
1 2 3
Q1 = m C dT
Q1 = 3.141 x 134.8 x (80-50) = 12702 J = 12.70 kJ
Q2 = 30.77 x 3.141 = 96.65 kJ
Q3 = m C dT
Q3 = 3.141 x 82.4 x (100 -80)
Q3 = 5176 J = 5.176 kJ
Q = Q1 + Q2 + Q3
Q = 12.70 + 96.55 + 5.176
Q = 114 kJ
enthalpy change = 114 kJ
The heat of vaporization of benzene (C6H6) is 30.77 kJ/mol at it's boiling point (80 C)....
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