Chapter 6, Problem 6.28E

Elemental gallium is another substance whose solid floats on its liquid: the density of $\text{Ga}\left(\text{s}\right)$ is $\text{5}{\text{.91 g/cm}}^{\text{3}}$, while the density of $\text{Ga}\left(l\right)$ is $\text{6}{\text{.09 g/cm}}^{\text{3}}$. The melting point of gallium under normal pressure is $302.\text{9 K}$. What pressure is necessary to reduce the melting point to $\text{298}\text{.1 K}$? The entropy of fusion of $\text{Ga}$ is $18.45\text{ J/mol}\cdot \text{K}$.