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Energetics

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Question 5

Which chemical equation represents the reaction for which the enthalpy change is equal to the standard enthalpy of formation of liquid ethanol?

A

2C(s)+6H(g)+O(g)→C2H5OH(l)2\text{C(s)} + 6\text{H(g)} + \text{O(g)} \rightarrow \text{C}_2\text{H}_5\text{OH(l)}2C(s)+6H(g)+O(g)→C2​H5​OH(l)

B

2C(g)+3H2(g)+12O2(g)→C2H5OH(l)2\text{C(g)} + 3\text{H}_2\text{(g)} + \frac{1}{2}\text{O}_2\text{(g)} \rightarrow \text{C}_2\text{H}_5\text{OH(l)}2C(g)+3H2​(g)+21​O2​(g)→C2​H5​OH(l)

C

2C(s)+3H2(g)+12O2(g)→C2H5OH(l)2\text{C(s)} + 3\text{H}_2\text{(g)} + \frac{1}{2}\text{O}_2\text{(g)} \rightarrow \text{C}_2\text{H}_5\text{OH(l)}2C(s)+3H2​(g)+21​O2​(g)→C2​H5​OH(l)

D

4C(s)+6H2(g)+O2(g)→2C2H5OH(l)4\text{C(s)} + 6\text{H}_2\text{(g)} + \text{O}_2\text{(g)} \rightarrow 2\text{C}_2\text{H}_5\text{OH(l)}4C(s)+6H2​(g)+O2​(g)→2C2​H5​OH(l)

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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