Heat of Combustion (Leaving Cert Chemistry): Quizzes

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Heat of Combustion
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Heat of combustion is the energy change when how many moles of substance are completely burned?

One mole

What condition is essential for complete combustion to occur?

Excess oxygen

What is the heat of combustion for complete combustion of carbon: C(s)+O2(g)→CO2(g)\text{C(s)} + \text{O}_2\text{(g)} \rightarrow \text{CO}_2\text{(g)}?

−394 kJ mol−1-394 \text{ kJ mol}^{-1}

What product forms during complete combustion of carbon?

Carbon dioxide

Are combustion reactions exothermic or endothermic?

Exothermic

What is the heat of combustion of methane (CH4\text{CH}_4)?

−890 kJ mol−1-890 \text{ kJ mol}^{-1}

At what temperature are standard heat of combustion values measured?

25°C

If 2C4H102\text{C}_4\text{H}_{10} releases −5754-5754 kJ, what is the heat of combustion per mole?

−2877 kJ mol−1-2877 \text{ kJ mol}^{-1}

What instrument is used to measure heat of combustion?

Bomb calorimeter

What is the specific heat capacity of water?

4200 J kg−1K−14200 \text{ J kg}^{-1} \text{K}^{-1}

What is the most common error in heat of combustion calculations?

Not converting grams to kilograms

In what units is heat of combustion typically expressed?

kJ mol−1\text{kJ mol}^{-1}

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