Oxalic acid is a toxic substance used by laundries to remove...

Oxalic acid is a toxic substance used by laundries to remove rust stains. Its composition is $26.7 \% \mathrm{C}, 2.2 \% \mathrm{H}$, and $71.1 \% \mathrm{O}$ (by mass), and its molecular mass is 90 amu. What is its molecular formula?

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Key Concepts

Molecular Mass

Molecular mass is the sum of the atomic masses of all atoms in a molecule, typically measured in atomic mass units (amu). It is essential when determining the molecular formula from the empirical formula, as the molecular mass must be a whole-number multiple of the empirical formula mass.

Molecular Formula Determination

Molecular formula determination involves using the molecular mass of a compound to find the actual number of atoms of each element present. This is done by dividing the known molecular mass by the empirical formula mass, and then multiplying the subscripts in the empirical formula by this factor to obtain the molecular formula.

Percent Composition

Percent composition refers to the percentage by mass of each element present in a compound. It is calculated by dividing the mass of each element by the total mass of the compound and then multiplying by 100. This concept is fundamental in stoichiometry and is used to deduce the formula of a compound.

Empirical Formula

The empirical formula of a compound represents the simplest whole-number ratio of the elements present. To determine the empirical formula from percent composition, one converts the mass percentages into moles by dividing by the atomic mass of each element, and then simplifies the ratios.

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