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Hess's Law can be used to calculate the average C-H bond energy in methane - CIE - A-Level Chemistry - Question 10 - 2011 - Paper 1

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Hess's Law can be used to calculate the average C-H bond energy in methane. ΔHᵃ = standard enthalpy change of atomisation ΔHᶻ = standard enthalpy change of formatio... show full transcript

Worked Solution & Example Answer:Hess's Law can be used to calculate the average C-H bond energy in methane - CIE - A-Level Chemistry - Question 10 - 2011 - Paper 1

Step 1

Which data values are needed in order to perform the calculation?

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Answer

To calculate the average C-H bond energy in methane using Hess's Law, we need to consider the enthalpy changes involved in the reaction. The key data required are:

  1. ΔHᵃ (C): This is necessary for the atomisation of carbon.
  2. ΔHᵃ (H): This accounts for the atomisation of hydrogen.
  3. ΔHᶻ (CH₄): This is the standard enthalpy change of formation for methane.

Thus, the correct option that encompasses all these necessary enthalpy values is A: ΔHᵃ (C), ΔHᵃ (H), ΔHᶻ (CH₄).

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