Silanes are silicon hydrides of general formula $$Si_nH_{2n+2}$$ and have several applications. From the data given below, the bond dissociation enthalpy of Si-Si bond can be deduced as. $$\Delta H$$ of the reaction $$2Si (s) + 3H_2 (g) \rightarrow Si_2H_6 (g)$$ is 80.3 $$\text{kJ mol}^{-1}$$, bond dissociation enthalpy for H-H is 436 $$\text{kJ mol}^{-1}$$, bond dissociation enthalpy for Si-H is 304 $$\text{kJ mol}^{-1}$$ and $$\Delta_f H [Si (g)]$$ is 450 $$\text{kJ mol}^{-1}$$.