Chemistry - Thermochemistry Question with Solution | TestHub

Silanes are silicon hydrides of general formula$\mathrm{S}{\mathrm{i}}_{\mathrm{n}}{\mathrm{H}}_{2\mathrm{n}+2}$and have several applications. From thedata given below, the bond dissociation enthalpy of Si-Si bond (in$\mathrm{k}\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$) is

Given:

∆H of the reaction$2\mathrm{S}\mathrm{i}\left(\mathrm{s}\right)+3{\mathrm{H}}_2\left(\mathrm{g}\right)\to \mathrm{ }\mathrm{S}{\mathrm{i}}_2{\mathrm{H}}_6\left(\mathrm{g}\right)$is 80.3$\mathrm{k}\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

Bond dissociation enthalpy for H - H = 436$\mathrm{k}\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

Bond dissociation enthalpy for Si - H = 304$\mathrm{k}\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$

${\mathrm{\Delta }}_{\mathrm{f}}\mathrm{H}\mathrm{ }\left[\mathrm{S}\mathrm{i}\left(\mathrm{g}\right)\right]=450\mathrm{ }\mathrm{k}\mathrm{J}\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$