Heat of Combustion (HSC SSCE Chemistry): Quizzes

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Heat of Combustion
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What does molar heat of combustion measure?

Heat released when 1 mole burns in oxygen

If propane has molar heat of combustion of 22202220 kJ mol−1^{-1}, what is its ΔH\Delta H?

−2220-2220 kJ mol−1^{-1}

Why is combustion always an exothermic process?

It releases heat energy to surroundings

Which substance has the highest molar heat of combustion?

Octane at 54605460 kJ mol−1^{-1}

Why do larger hydrocarbons have higher heats of combustion?

More C and H atoms to react with oxygen

What principle allows us to measure heat of combustion using water?

Heat released by fuel = heat absorbed

In q=mcΔTq = mc\Delta T, what does cc represent?

Specific heat capacity of water

At what pressure is molar heat of combustion formally defined?

100.0100.0 kPa

What products must form in complete combustion for the formal definition?

CO2(g)\text{CO}_2(\text{g}) and H2O(l)\text{H}_2\text{O}(\text{l})

How is heat of combustion measured?

Indirectly using calorimetry

Explore HSC SSCE Chemistry Revision Notes by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

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Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

Explore HSC SSCE Chemistry Flashcards by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

Explore HSC SSCE Chemistry Exam Questions by Topics

Energy Changes in Chemical Reactions

Enthalpy and Hess's Law

Entropy and Gibbs Free Energy

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