Chemical Engineering Questions and Answers – Heat (Enthalpy) of Reaction

This set of Basic Chemical Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Heat (Enthalpy) of Reaction”.

1. The standard heat of reaction is a heat of reaction for how many moles of compound?
a) 0
b) 1
c) 2
d) 3
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2. What is the heat of reaction for CH₄ + 2O₂ -> CO₂ + 2H₂O, if heat of formation of CH₄, O₂, CO₂ and H₂O are 10 J, 5 J, 6 J, and 12 J respectively?
a) -10 J
b) 10 J
c) -20 J
d) 20 J
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3. What is the heat of reaction for 2H₂ + O₂ -> 2H₂O, if heat of formation of H₂, O₂, and H₂O are 2 J, 5 J, and 10 J respectively?
a) 2 J
b) 5 J
c) 8 J
d) 11 J
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4. What is the heat of reaction for C₂H₄ + 3O₂ -> 2CO₂ + 2H₂O, if heat of formation of C₂H₄, O₂, CO₂, and H₂O are 10 J, 5 J, 6 J and 2 J respectively?
a) -4 J
b) -2 J
c) 0
d) 4 J
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5. What is the heat of reaction for C₆H₆ + 3H₂ -> C₆H₁₂, if heat of formation of C₆H₆, H₂, and C₆H₁₂ are 25 J, 5 J and 50 J respectively?
a) 10 J
b) 20 J
c) 30 J
d) 35 J
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6. What is the enthalpy of reaction for C + O₂ -> CO₂, if the conversion of C is 50%, and heat of formation of C, O₂, and CO₂ are 0, 0 and 10 J.
a) 5 J
b) 10 J
c) 15 J
d) 20 J
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7. What is the enthalpy of reaction for CH₄ + 2O₂ -> CO₂ + 2H₂O, if the conversion of CH₄ is 50%, and heat of formation of CH₄, O₂, CO₂, and H₂O are 10 J, 0, 6 J and 4 J?
a) 0
b) 2 J
c) 4 J
d) 6 J
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8. What is the enthalpy of reaction for C₂H₄ + 3O₂ -> 2CO₂+ 2H₂O, if the conversion of CH₄ is 50%, and heat of formation of CH₄, O₂, CO₂, and H₂O are 10 J, 0, 6 J and 4 J?
a) 0
b) 2 J
c) 5 J
d) 10 J
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9. What is the enthalpy of reaction for CO₂ + 4H₂ -> 2H₂O + CH₄, if the conversion of CO₂ is 50%, and heat of formation of CO₂, H₂, H₂O, and CH₄ are 6 J, 0, 4 J and 10 J?
a) 2 J
b) 5 J
c) 6 J
d) 9 J
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10. What is the enthalpy of reaction forC₆H₆ -> 3C₂H₂, if the conversion of C₆H₆ is 80%, and heat of formation of C₆H₆, and C₂H₂ are 24 J, and 8 J?
a) 0
b) 2.4 J
c) 4.8 J
d) 5.6 J
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11. What is the enthalpy change of a reaction at 45^oC, if the enthalpy of reactant at 45^oC and 25^oC are 10 J and 6 J, and enthalpy of product at 45^oC and 25^oC are 15 J and 8 J, and the enthalpy change of reaction at 25^oC is 10 J?
a) 14 J
b) 21 J
c) 27 J
d) 34 J
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12. What is the enthalpy change of a reaction at 35^oC, if the enthalpy of reactant at 35^oC and 25^oC are 18 J and 10 J, and enthalpy of product at 35^oC and 25^oC are 12 J and 8 J, and the enthalpy change of reaction at 25^oC is 15 J?
a) 9 J
b) 14 J
c) 22 J
d) 27 J
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13. What is the enthalpy change of a reaction at 35^oC, if the enthalpy of reactant at 35^oC and 25^oC are 22 J and 15 J, and enthalpy of product at 35^oC and 25^oC are 10 J and 5 J, and the enthalpy change of reaction at 25^oC is 36 J?
a) 12 J
b) 24 J
c) 36 J
d) 48 J
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14. What is the enthalpy change of a reaction at 30^oC, if the enthalpy of reactant at 30^oC and 25^oC are 18 J and 15 J, and enthalpy of product at 30^oC and 25^oC are 10 J and 8 J, and the enthalpy change of reaction at 25^oC is 45 J?
a) 10 J
b) 25 J
c) 50 J
d) 100 J
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15. What is the enthalpy change of a reaction at 90^oC, if the enthalpy of reactant at 90^oC and 25^oC are 60 J and 25 J, and enthalpy of product at 90^oC and 25^oC are 80 J and 10 J, and the enthalpy change of reaction at 25^oC is 5 J?
a) 10 J
b) 50 J
c) 110 J
d) 150 J
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