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The heat of formation of ethene C2H4 is…

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Hydrogen fuel from ammonia - German

Hydrogen fuel from ammonia - German
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The heat of formation of ethene C2H4 is 50KJ/mol, and that of ethane C2H6 is -82KJ/mol, Calculate the heat evolved in the process:

The heat of formation of ethene C_2 H_4 is
  • A. -122KJ
  • B. -132KJ
  • C. -88KJ
  • D. -60KJ

QUICK ANSWER…

B

SOLUTION 

Heat evolved or absorbed for a reaction

= heat of formation of product(s) – heat of formation of reactant(s)

Heat of formation of product = -82KJ per mol

Heat of formation of reactant = 50KJ per mol

Therefore, heat evolved in the process = -82 – 50 = -132KJ per mol

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Now for the right answer to the above question:

  1. Option A is incorrect.
  2. Option B is correct.
  3. C is incorrect.
  4. D is not the correct answer.

KEY-POINTS…

You may please note these/this:

  • Heat evolved or absorbed in a reaction = heat of formation of product(s) – heat of formation of reactant(s)
  • Observe that the answer is given in KJ and not in KJ per mol, this is because from the equation, just one mole of ethane was produced, so option B is in order.

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/ culled from 2019 JAMB-UTME Chemistry question 27 /

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