Neco 2018 Chemistry Question 42
Practice objective / multiple choice question 42 from the 2018 Neco Chemistry examination.
Given the average bond enthalpies (kJ·mol⁻¹): H-H 436, C-H 413, N-H 391, O-H 467, S-H 363 and the N\equiv N triple‑bond 945, use these values to calculate the standard enthalpy change of formation for the binary hydrides CH\(_4\), NH\(_3\), H\(_2\)O and H\(_2\)S from their elements in their standard states. Which hydride releases the greatest amount of heat on formation (i.e., has the most negative \(\Delta H_f^\circ\))?
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About This Question
This is Neco 2018 Chemistry Question 42. It is one of the objective questions from the 2018 Neco Chemistry examination.
Difficulty level: Hard .
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