The vapor pressure of Substance X is measured at several temperatures: temperature vapor pressure -11. °C 0.0799 atm 2. °C 0.101 atm 15. °C 0.125 atm Use this information to calculate the enthalpy of vaporization of X.

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A: Boiling point = - 11◦C   In Kelvin = (- 11 + 273.15) K                 = 262.15 K

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Mass Spectrometry

This process is an instrumental method in which a sample is changed to fast moving positive ions by electron bombardment. The charged particles vary due to their different mass to charge ratio and are estimated with the help of this difference. It is also called mass spectroscopy.