Chapter 14

Applying the Clausius-Clapeyron equation. (a) The vapor pressure of water is $23\mathrm{mmHg}$ at $T=$ $300\mathrm{K}$ and $760\mathrm{mmHg}$ at $T=373\mathrm{K}$. Calculate the enthalpy of vaporization $\mathrm{\Delta }{h}_{\text{vap }}$. (b) Assuming that each water has $z=4$ nearest neighbors, calculate the interaction energy $w_{AA}$.

Why do spray cans get cold? Explain why an aerosol spray can gets cold when you spray the contents.

Squeezing ice. Use the Clapeyron relation to compute the pressure that is required to lower the melting temperature of ice by $10\mathrm{K}$. For water, $\mathrm{\Delta }h=6.008\mathrm{kJ}{\mathrm{mol}}^{-1}$ and $\mathrm{\Delta }v=-1.64{\mathrm{cm}}^3{\mathrm{mol}}^{-1}$.