15 mL of gaseous hydrocarbon requires 45 mL of oxygen for complete combustion which produces 3

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15 mL of gaseous hydrocarbon requires 45 mL of oxygen for...

$15 \mathrm{~mL}$ of gaseous hydrocarbon requires $45 \mathrm{~mL}$ of oxygen for complete combustion which produces $30 \mathrm{~mL}$ of $\mathrm{CO}_{2}$ gas, measured under identical conditions. The formula of the hydrocarbon is $\mathrm{C}_{x} \mathrm{H}_{y}$. The ratio $\underline{\mathrm{y}}$ is X

Key Concepts

Combustion Reaction Stoichiometry

This concept involves writing and balancing chemical equations for the combustion of hydrocarbons, where a hydrocarbon reacts with oxygen to produce carbon dioxide and water. In these reactions, the coefficients indicate the relative number of moles of reactants and products involved. This understanding is crucial for predicting the amounts of oxygen consumed and products formed during combustion.

Avogadro's Law

Avogadro's Law states that equal volumes of all gases, at the same temperature and pressure, contain the same number of molecules. This principle is pivotal when using gas volume measurements to infer mole ratios in a reaction, allowing one to directly relate the measured volumes of gaseous substances to their molar quantities.

Stoichiometric Ratios

This key concept pertains to the quantitative relationships derived from a balanced chemical equation. Stoichiometric ratios are used to calculate the amounts in which reactants combine and products form, facilitating the determination of unknown quantities such as the empirical formula of a compound based on given volume or mass data.

Empirical Formula Determination

Empirical formula determination involves using experimental data, such as gas volume measurements from combustion, to deduce the simplest whole-number ratio of atoms in a compound. This concept is essential in problems where the molecular structure is inferred from combustion analysis and stoichiometric calculations, allowing one to find relationships between the numbers of different elements present in the hydrocarbon.

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