Which equation represents the average bond enthalpy of the Si−H bond in SiH 4 ?A. SiH 4 (g) → SiH3 (g) + H (g)B. 14 SiH 4 (g) → 14 Si (g) + H (g)C. SiH 4 (g) → SiH3 (g) + 12 H 2 (g)D. SiH 4 (g) → Si (g) + 4H (g)
Question
Which equation represents the average bond enthalpy of the Si−H bond in SiH 4 ?A. SiH 4 (g) → SiH3 (g) + H (g)B. 14 SiH 4 (g) → 14 Si (g) + H (g)C. SiH 4 (g) → SiH3 (g) + 12 H 2 (g)D. SiH 4 (g) → Si (g) + 4H (g)
Solution
The correct equation that represents the average bond enthalpy of the Si−H bond in SiH4 is D. SiH4 (g) → Si (g) + 4H (g). This is because bond enthalpy is the energy required to break one mole of a bond in a gaseous molecule to produce gaseous atoms. In this case, we are breaking the Si-H bonds in SiH4 to produce Si and H atoms, all in gaseous state.
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