Gce Model Questions Vol1 2023 Chemistry Question 25
Practice objective / multiple choice question 25 from the 2023 Gce Model Questions Vol1 Chemistry examination.
The oxide \( \mathrm{X_2O_5} \) decomposes on heating according to: \( \mathrm{X_2O_5 \rightarrow X_2O_3 + O_2} \), with a standard enthalpy change \( \Delta H^\circ = +150\ \mathrm{kJ\ mol^{-1}} \). The average X-O bond energy in \( \mathrm{X_2O_3} \) is \( 560\ \mathrm{kJ\ mol^{-1}} \), and the O=O bond energy in \( \mathrm{O_2} \) is \( 498\ \mathrm{kJ\ mol^{-1}} \). Assuming that the number of X-O bonds broken equals the number of oxygen atoms in \( \mathrm{X_2O_5} \) and that the number of X-O bonds formed equals the number of oxygen atoms in \( \mathrm{X_2O_3} \), calculate the average X-O bond energy in \( \mathrm{X_2O_5} \).
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This is Gce Model Questions Vol1 2023 Chemistry Question 25. It is one of the objective questions from the 2023 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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