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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEC
Chapter: Thermodynamics (C)

Olympiad workbook · NSEC · Thermodynamics (C)

Silanes are silicon hydrides of general formula Si_ n H_ 2 n+2 and...

Silanes are silicon hydrides of general formula

\mathrm{Si}_{\mathrm{n}} \mathrm{H}_{2 \mathrm{n}+2}

and have several applications. From the data given below, the bond dissociation enthalpy of

\mathrm{Si}-\mathrm{Si}

bond can be deduced as:

\Delta \mathrm{H}

of the reaction

2 \mathrm{Si}(\mathrm{s})+3 \mathrm{H}_2(\mathrm{~g}) \rightarrow \mathrm{Si}_2 \mathrm{H}_6(\mathrm{~g})

is

80.3 \mathrm{~kJ} \mathrm{~mol}^{-1}

Bond dissociation enthalpy for

\mathrm{H}-\mathrm{H}=436 \mathrm{~kJ} / \mathrm{mol}

Bond dissociation enthalpy for Si-H =

304 \mathrm{~kJ} / \mathrm{mol}\Delta \mathrm{f}_H[\mathrm{Si}(\mathrm{g})]=450 \mathrm{~kJ} / \mathrm{mol}

Options

A $-304 \mathrm{~kJ} \mathrm{~mol}^{-1}$
B $384.3 \mathrm{~kJ} \mathrm{~mol}^{-1}$
C $304 \mathrm{~kJ} \mathrm{~mol}^{-1}$
D $-384.3 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Correct answer

C. $304 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Step-by-step solution

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