[填空题]
Consider a monoatomic solid with a weaklyh dhiv*k i6ccz/*dz 4/ bound cubic lattice, with each atom9ja jsql / dof 77mhz60s;hvgzev346t connected to six neighbors3amh6gtvl dh907qso 6 /sjfz7ev; z4j, each bond having a binding energy of $ 3.9 \times 10^{-3}\ \text{eV} $. When this solid melts, its latent heat of fusion goes directly into breaking the bonds between the atoms. Estimate the latent heat of fusion for this solid, in $ \text{J/kg} $. [Hint: Show that in a simple cubic lattice (Fig. Below), there are three times as many bonds as there are atoms, when the number of atoms is large.]$L_{\text{fusion}} =$ $\times 10^4\ \text{J/kg}$
