The vapor pressure of an unknown solid is given by ln(P/Torr)=22.413−(2211/T), and the vapor pressure of the liquid phase of the same substance is approximately given by ln(P/Torr)=18.352−(1736/T). Determine the enthalpy of vaporization, the enthalpy of sublimation, and the enthalpy of fusion. Then calculate the triple point temperature and pressure

Use Trouton's rule to estimate the enthalpy of vaporization for a substance whose boiling point is 80 C.

At high altitudes, the ambient air pressure can be significantly less than 1 bar, so water boils at a lower temperature than 100 C. What is the boiling point of water at an altitude where the ambient air pressure is 0.4 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.

Measurements of the saturated vapor pressure of liquid SiCl4 give 0.1396 atm at 280 K and 0.4880 atm at 310 K. Calculate the normal boiling temperature of SiC14.

90. The normal boiling point of water is 100.00 °C and the enthalpy of vaporization at this temperature is ¢vapH = 40.657 kJ mol-1. What would be the boiling point of water if it were based on a pressure of 1 bar instead of the standard atm?

At high altitudes, the ambient air pressure can be significantly less than 1 bar, so water boils at a lower temperature than 100 C. What is the boiling point of water at an altitude where the ambient air pressure is 0.72 bar? The enthalpy of vaporization of water near its boiling point is 40.7 kJ/mol.

Solid NaF has the so-called NaCl structure. The shortest distance between the centre of a sodium cation and the centre of a fluoride anion is 231.5 pm. Calculate the length of the edge of the conventional face-centred cubic unit cell of NaF. Calculate the density of solid NaF. Calculate the shortest distance (centre to centre) between two fluoride anions in solid NaF.

The figure shows the phase diagram corresponding to the element sulfur. Sulfur exists as liquid, gas, and two solids, rhombic and monoclinic. 1- Describe the phase changes that occur when S is decompressed (lower P) from 10 atm to 106atm at constant temperature of 100 °C. 2- Indicate the temperature and the pressure for the triple point B, and which phases coexist В 10.0 Solid(rhombic) Liquid 1.0 Solid (monoclinic) 5х 104 Gas A 1 x 104 95.4 114 119 445 Temperature (in degree C) Pressure (in atm)