Mercurous chloride is a fungicide. If the molar mass is 470 g / mol and the percent composition

step 1 To determine the molecular formula, we must first determine the empirical formula. To get the em

Mercurous chloride is a fungicide. If the molar mass is 470...

Mercurous chloride is a fungicide. If the molar mass is $470 \mathrm{~g} / \mathrm{mol}$ and the percent composition is $85.0 \% \mathrm{Hg}$ and $15.0 \% \mathrm{Cl}$, what is the molecular formula of mercurous chloride?

Key Concepts

Molecular Formula Determination

Once the empirical formula is known, the molecular formula can be determined by comparing the empirical formula mass to the given molar mass, yielding a multiplication factor. Multiplying the subscripts in the empirical formula by this factor provides the molecular formula, which represents the actual numbers of atoms of each element in the compound.

Empirical Formula

The empirical formula represents the simplest whole-number ratio of the elements present in a compound. It is derived by converting the percent composition of each element into moles and then finding the simplest ratio between these values. This formula serves as a basis for determining the actual molecular formula when the molar mass is known.

Percent Composition

This concept involves determining the mass percentage of each element in a compound. It is calculated by taking the mass of a particular element in one mole of the compound, dividing it by the total molar mass of the compound, and multiplying by 100. This information is crucial for determining the ratio of the elements present and, ultimately, the empirical formula of the compound.

Molar Mass

Molar mass is the mass of one mole of a substance, usually expressed in grams per mole. It is the sum of the atomic masses of all the atoms in a molecular formula. In problems where percent composition is given, the molar mass is used to scale the empirical formula to the actual molecular formula by comparing the calculated empirical formula mass with the provided molar mass.

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