Practice Standard Enthalpy Of Combustion (δh_c°) (4.1.5) - Chapter 4: Energetics/Thermochemistry

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6 sample questions

Question 1.
What is the standard enthalpy of combustion (ΔH_c°)?
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It relates to heat released during burning.
Question 2.
Is ΔH_c° positive or negative in combustion reactions?
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Think about heat release.
3Question 3.
What is ΔH_c° for combustion reactions?
- Positive
- Negative
- Zero
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Recall that exothermic means heat exit.
4Question 4.
True or False: The enthalpy of combustion can be positive.
- True
- False
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All combustions release energy, remember that!
Question 5.
Calculate the ΔH_c° for the complete combustion of 3 moles of octane (C8H18) if it releases -11400 kJ.
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Divide total energy by number of moles.
Question 6.
An experiment shows that the combustion of 0.5 moles of a substance releases -650 kJ. Discuss how this value compares to values for other fuels like methane and propane.
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Relate energy values to determine effectiveness.

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