Diborane

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Exercise collection on diborane

Work order

Is diborane an endergonic compound under standard conditions? $Δ H ° = 35,6 kJ {mol}^{-1}$ , $Δ S. ° = - 171,6 J K^{-1} {mol}^{-1}$ .

if $Δ G$ > 0, the reaction is endergonic. Off $Δ G$ = $Δ H$ - $T$ $Δ S.$ follows: $Δ G °$ (B.₂H₆) = 86,7 $kJ {mol}^{-1}$ .Diborane is at 298 $K$ an endergonic connection. From the strongly positive value of $Δ G °$ it can be seen that no diborane is formed from the elements at normal temperature. An increase in temperature favors the formation of endergonic compounds, but in the case of diborane this is countered by the thermolysis that already begins at low temperatures.

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Work order: Match the peaks $m / z$ 10 and $m / z$ 11 to the respective molecular fragments. Make a statement about their intensity ratio. Discuss the intensity ratio of the signals with $m / z$ 26, 27 and 28.
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