Ethylene glycol? Dioxane is a common solvent for plastics....

ethylene glycol? Dioxane is a common solvent for plastics. If the molar mass is $88 \mathrm{~g} / \mathrm{mol}$ and the percent composition is $54.5 \% \mathrm{C}, 9.15 \% \mathrm{H}$, and $36.3 \% \mathrm{O}$, what is the molecular formula of dioxane?

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Key Concepts

Percentage Composition Analysis

This concept involves determining the mass percentage of each element in a compound. By knowing the percentages and the total molar mass, one can calculate the mass contribution of each element in one mole of the compound, which is a foundational step in relating percentage data to actual amounts of atoms.

Empirical Formula Determination

Empirical formula determination is the process of converting mass percentages into the simplest whole-number ratio of atoms present in a compound. This is done by dividing the mass of each element by its atomic mass to obtain moles and then normalizing these values to find the simplest ratio.

Molecular Formula Determination Using Molar Mass

After obtaining the empirical formula, the molecular formula determination involves comparing the empirical formula weight to the given molar mass. The ratio between the molar mass and the empirical formula weight is used to scale the empirical formula, resulting in the actual molecular formula of the compound.

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