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Energetics

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Question 6

Some bond enthalpies are given.

BondC−C\text{C}-\text{C}C−CC=C\text{C}=\text{C}C=CC−H\text{C}-\text{H}C−HH−H\text{H}-\text{H}H−H
Bond enthalpy / kJ mol−1\text{kJ~mol}^{-1}kJ mol−1348612413436

Which is the enthalpy change of this reaction in kJ mol−1\text{kJ~mol}^{-1}kJ mol−1?

C2H4(g)+H2(g)→C2H6(g) \text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{(g)} \rightarrow \text{C}_2\text{H}_6\text{(g)} C2​H4​(g)+H2​(g)→C2​H6​(g)
A

−126-126−126

B

+126+126+126

C

−700-700−700

D

+700+700+700

Markscheme

Energetics Questions

  1. A Level
  2. /Chemistry
  3. /Energetics

34 exam-style questions on AQA A Level Chemistry Energetics, covering Enthalpy change, Calorimetry, Applications of Hess's law, and Bond enthalpies. Each one has a worked solution and a mark scheme showing where the marks go.

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