Silanes are silicon hydrides of general formula S i n H 2 n + 2 and have several applications. From thedata given below, the bond dissociation enthalpy of Si-Si bond (in k J m o l - 1 ) is Given: ∆H of the reaction 2 S i s + 3 H 2 g → S i 2 H 6 g is 80.3 k J m o l - 1 Bond dissociation enthalpy for H - H = 436 k J m o l - 1 Bond dissociation enthalpy for Si - H = 304 k J m o l - 1 Δ f H S i g = 450 k J m o l - 1