Values of the specific internal energy of bromine at three conditions are listed
ID: 1053727 • Letter: V
Question
Values of the specific internal energy of bromine at three conditions are listed here. What reference state was used to generate the listed specific internal energies? Calculate delta cap U (kJ/mol) for a process in which bromine vapor at 300 K is condensed at constant pressure. Then calculate delta cap H (kJ/mol) for the same process. (Sec Example 7.4-1.) Finally, calculate delta H (kJ) for 5.00 mol of bromine undergoing the process. Bromine vapor in a 5.00-liter container at 300 K and 0.205 bar is to be heated to 340 K. Calculate the heat (kJ) that must be transferred to the gas to achieve the desired temperature increase, assuming that cap U is independent of pressure. In reality, more heat than the amount calculated in Part (c) would have to be transferred to the container to raise the gas temperature by 40 K. State two reasons for this.Explanation / Answer
1.25 degree celcius and one atmosphere is used as reference state
2. H=E + PV
E = E2 - E1 = - 28.24 - 0 = -28.24
H = - 28.24 + 0.310( 0.0516 - 79.94 ) = - 52.69 KJ/Mol
for 5 mol 5×(-52.69 ) = - 263.47 KJ
3.This indicate the heat capacity at constant pressure i.e dH÷dT at constant pressure
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