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Hydrogen fuel from ammonia - German
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:
- A. -122KJ
- B. -132KJ
- C. -88KJ
- D. -60KJ
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
Now for the right answer to the above question:
- Option A is incorrect.
- Option B is correct.
- C is incorrect.
- D is not the correct answer.
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 /