[填空题]
Consider a monoatomic solid wit v,1gdgvm5j;7b 2j u x.:pqujjh a weakly bound cubic lattice, wia (*w0apk pwsno*y p;2)c ky1nth each atom connected to six neighbonp;np*cp ao) 1ya 2(yk0sw*kwrs, 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}} =$ $\times 10^4\ \text{J/kg}$
