1. Tardigrade
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  3. Chemistry
  4. Silanes are silicon hydrides of general formula SinH2 n + 2 and have several applications. From thedata given below, the bond dissociation enthalpy of Si-Si bond (in kJmol- 1 ) is Given: ∆H of the reaction 2Si(s)+3H2(g) arrow Si2H6(g) is 80.3 kJmol- 1 Bond dissociation enthalpy for H - H = 436 kJmol- 1 Bond dissociation enthalpy for Si - H = 304 kJmol- 1 Δ mathrmf mathrmH[ mathrmSi( mathrmg)]=450 mathrmkJmol-1

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Q. Silanes are silicon hydrides of general formula $Si_{n}H_{2 n + 2}$ and have several applications. From thedata given below, the bond dissociation enthalpy of Si-Si bond (in $kJmol^{- 1}$ ) is

Given:

∆H of the reaction $2Si\left(s\right)+3H_{2}\left(g\right) \rightarrow \, Si_{2}H_{6}\left(g\right)$ is 80.3 $kJmol^{- 1}$

Bond dissociation enthalpy for H - H = 436 $kJmol^{- 1}$

Bond dissociation enthalpy for Si - H = 304 $kJmol^{- 1}$

$\Delta_{\mathrm{f}} \mathrm{H}[\mathrm{Si}(\mathrm{g})]=450 \mathrm{kJmol}^{-1}$

NTA AbhyasNTA Abhyas 2020Thermodynamics

Solution:

Solution

$8.03=2\times 405+3\times 436-\left[\left(S i - S i\right) + 6 \left(304\right)\right]$

(Si - Si) Bond energy $=304 \, kJmol^{- 1}$