Practice Enthalpy Of Combustion (δh_c°) (1.4.2) - Unit 5: Energetics and Thermochemistry

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6 sample questions

Question 1.
What does ΔH_c° refer to?
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Think about the definition of combustion.
Question 2.
Is the combustion of fuels typically an exothermic or endothermic process?
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Consider if heat is released or absorbed.
3Question 3.
What is the enthalpy of combustion for methane?
- -2,803 kJ/mol
- -890.3 kJ/mol
- -1,500 kJ/mol
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Recall the combustion of methane.
4Question 4.
True or False: Combustion reactions are always exothermic.
- True
- False
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Think about the definition of combustion.
Question 5.
Calculate the total energy released from burning 4 moles of propane (C₃H₈), given ΔH_c° = -2,221 kJ/mol.
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Multiply moles by the enthalpy of combustion.
Question 6.
Explain why a higher ΔH_c° can indicate a more efficient fuel in vehicles.
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Think about what efficiency in fuel means in practical terms.

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