Equal volumes of C2 II2 and II2 are combusted under identical conditions. The ratio of their hea

step 1 Equal volumes of acetylene and hydrogen are combusted under identical conditions. The ratio of t

Equal volumes of C2 II2 and II2 are combusted under...

Equal volumes of $\mathrm{C}_{2} \mathrm{II}_{2}$ and $\mathrm{II}_{2}$ are combusted under identical conditions. The ratio of their heat of combustion is $\mathrm{H}_{2(g)}+\frac{1}{2} \mathrm{O}_{2(g)} \longrightarrow \mathrm{H}_{2 i \mathrm{~g})} ; \Delta / l=-241.8 \mathrm{~kJ}$ $\mathrm{C}_{2} \mathrm{H}_{2(\mathrm{~g})}+2 \frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2 \mathrm{~g}}+\mathrm{H}_{2} \mathrm{O}_{\mathrm{k}_{\mathrm{k}}} ; \Delta I I=$ $1300 \mathrm{~kJ}$ (1) $5.37 / 1$ (2) $1 / 5.37$ (3) $1 / 1$ (4) $4 / 5$

Equal volumes of $\mathrm{C}_{2} \mathrm{II}_{2}$ and $\mathrm{II}_{2}$ are combusted under identical conditions. The ratio of their heat of combustion is $\mathrm{H}_{2(g)}+\frac{1}{2} \mathrm{O}_{2(g)} \longrightarrow \mathrm{H}_{2 i \mathrm{~g})} ; \Delta / l=-241.8 \mathrm{~kJ}$
$\mathrm{C}_{2} \mathrm{H}_{2(\mathrm{~g})}+2 \frac{1}{2} \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2 \mathrm{~g}}+\mathrm{H}_{2} \mathrm{O}_{\mathrm{k}_{\mathrm{k}}} ; \Delta I I=$
$1300 \mathrm{~kJ}$
(1) $5.37 / 1$
(2) $1 / 5.37$
(3) $1 / 1$
(4) $4 / 5$

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Key Concepts

Heat of Combustion

Heat of combustion is the energy released when one mole of a substance is completely burned in oxygen under standard conditions. It provides a per-mole measure of the energy content of a substance and is a key factor in comparing different fuels.

Ideal Gas Law and Avogadro’s Principle

According to the ideal gas law and Avogadro’s principle, equal volumes of gases at the same temperature and pressure contain the same number of moles. This concept is crucial when comparing the combustion of gases because equal volumes mean equal mole comparisons, allowing heat release per mole to directly reflect the overall energy released from equal volumes.

Combustion Reaction Stoichiometry

Combustion reaction stoichiometry involves writing balanced chemical equations for the combustion process to understand the proportional relationships between reactants and products. By analyzing these stoichiometric relationships alongside the per-mole heats of combustion, one can determine ratios of total energy released when equal volumes of different fuels are burned.

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