n unknown gas, X2(g), which behaves much like N2(g) =N), is analysed and the following enthalpies of rmation are obtained: as ΔΗ (g) 402 kJ/mol (g) 217 kJ/mol 2H4(g) 199 kJ/mol e also know that the X-H bond energy is 334 kJ/mol. se this information to estimate the X-X (single-)bond ergy in the XaHa molecule

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Chapter1: Chemical Foundations
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Bond Order and Bond
Energy
An unknown gas, X2(g), which behaves much like N2(g)
(N=N), is analysed and the following enthalpies of
formation are obtained:
Gas
ΔΗ
X(g)
402 kJ/mol
H(g)
217 kJ/mol
X2H4(g) 199 kJ/mol
We also know that the X-H bond energy is 334 kJ/mol.
Use this information to estimate the X-X (single-)bond
energy in the X2H4 molecule.
Give your answer to the nearest 1 kJ/mol.
Transcribed Image Text:Bond Order and Bond Energy An unknown gas, X2(g), which behaves much like N2(g) (N=N), is analysed and the following enthalpies of formation are obtained: Gas ΔΗ X(g) 402 kJ/mol H(g) 217 kJ/mol X2H4(g) 199 kJ/mol We also know that the X-H bond energy is 334 kJ/mol. Use this information to estimate the X-X (single-)bond energy in the X2H4 molecule. Give your answer to the nearest 1 kJ/mol.
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