Question detail
Calculate the mean bond enthalpy of a C-H bond if the total energy required to break 4 C-H bonds in methane (CH₄) is 1660 kJ/mol. Show your working.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Energetics
Question
Calculate the mean bond enthalpy of a C-H bond if the total energy required to break 4 C-H bonds in methane (CH₄) is 1660 kJ/mol. Show your working.
Answer
Mean bond enthalpy = Total energy / Number of bonds = 1660 kJ/mol / 4 = 415 kJ/mol.
Explanation
The calculation demonstrates how to derive mean bond enthalpy from total energy and the number of bonds broken. This question tests the application of the concept in a quantitative context, reinforcing the understanding of bond energies.
Common mistake
Mean Bond Enthalpy Confusion
Students often confuse mean bond enthalpy with the actual bond enthalpy of specific bonds in a molecule.
Mean bond enthalpy is an average value for a bond type across different compounds. To define it, state: Mean bond enthalpy is the average energy required to break one mole of a specific type of bond in a gaseous molecule. For example, the mean bond enthalpy for a C-H bond is calculated by averaging the bond energies from various compounds containing C-H bonds.
Related flashcards
Flashcard 1 of 5
Related practice questions
Question 1 of 5
Choose an answer, get feedback, then move sideways through the set.