Past exam of the MPhil in micro- and nanotechnology enterprise course of the University of Cambridge / 2017 / Paper 1 / Section B / 10 / iv / a / Solution

Use the normal boiling point as the reference, $T_B=373.15\mathrm{K}$ and $P_B=101325\mathrm{Pa}$. At $T=313.15\mathrm{K}$,This is approximately 0.0795 atmosphere. It uses the supplied constant enthalpy of vaporization approximation across a 60 K interval; it should not be presented as an exact tabulated vapor pressure. Absolute temperature, rather than Celsius values, belongs in the exponential.