The following data are given for p-chloroaniline: mol. wt: 177 g/mol; vapor pres

Question

The following data are given for p-chloroaniline: mol. wt: 177 g/mol; vapor pressure at the mp: 5.0 mmHg; normal mp: 70 degrees C; vapor pressure at 100 degrees C: 20 mmHg; Delta H f: 4700 cal/mol; densities at the mp: solid 1.45 g/cm^3, liquid 1.15 g/cm^3

(a) Calculate the heat of vaporization

(b) State the assumptions and approximations involved in the equations used in (a)

(c) State whether the mp under 100 atm would be greater or less than 70 degrees Celcius and show your statement MATHEMATICALLY..

Explanation / Answer

To determine the heat of vaporization you must first determine the amount of heat the substance gave off to water. You can do this by multiplying the mass of water by the change in temperature and the specific heat capacity of water. heat = specific heat H2O x mass H2O x change in temp

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