Vapour pressure and boiling

You will write functions for the Clausius-Clapeyron equation. One finds the vapour pressure at a temperature. One finds the boiling point at a pressure. One finds the enthalpy of vaporisation from two measurements. One finds Trouton's ratio.

The idea. $\ln\dfrac{P_2}{P_1} = -\dfrac{\Delta H}{R}\left(\dfrac{1}{T_2} - \dfrac{1}{T_1}\right)$ with $T$ in kelvin and $\Delta H$ in J/mol. The reference point is the normal boiling point, $T_b$ at $101.325\ \text{kPa}$. The enthalpies in the tasks are in kJ/mol, so the functions must change them to J/mol.

Your tasks.

1. Complete vapour_pressure(celsius, dH, Tb), which returns the pressure in kPa.
2. Complete boiling_point(P, dH, Tb), which returns the boiling point in degrees Celsius.
3. Complete enthalpy(P1, T1, P2, T2), which returns $\Delta H$ in kJ/mol from two points (temperatures in K).
4. Complete trouton(dH, Tb), which returns $\Delta H/T_b$ in J K$^{-1}$ mol$^{-1}$.