What are the formulas for percentage composition, empirical formula, mass percent, mole fraction, and molarity?
Understand the Problem
The question is asking about concepts related to percentage composition, empirical formulas, stoichiometry, and concentration calculations in chemistry.
Answer
For percentage composition, use (Mass of element / Molar mass of compound) x 100. For empirical formula, convert masses to moles, and divide by the smallest mole value. For mass percent, use (Mass of solute / Mass of solution) x 100. For mole fraction, use Number of moles of solute / (Number of moles of solute + Number of moles of solvent). For molarity, use Number of moles of solute / Volume of solution in L.
For percentage composition, use (Mass of element / Molar mass of compound) x 100. For empirical formula, convert mass percentages to masses, then to moles, and divide by the smallest mole value. For mass percent, use (Mass of solute / Mass of solution) x 100. For mole fraction, use Number of moles of solute / (Number of moles of solute + Number of moles of solvent). For molarity, use Number of moles of solute / Volume of solution in L.
Answer for screen readers
For percentage composition, use (Mass of element / Molar mass of compound) x 100. For empirical formula, convert mass percentages to masses, then to moles, and divide by the smallest mole value. For mass percent, use (Mass of solute / Mass of solution) x 100. For mole fraction, use Number of moles of solute / (Number of moles of solute + Number of moles of solvent). For molarity, use Number of moles of solute / Volume of solution in L.
More Information
These formulas are essential in chemistry for determining the composition of substances, their empirical formulas, and to calculate concentrations in solutions.
Tips
Make sure to use the correct units and always check that your number of significant figures is appropriate.
Sources
- Percent Composition, Empirical and Molecular Formulas - chem.libretexts.org
- Formula Mass, Percent Composition, and the Mole - chem.libretexts.org
- Worked example: Calculating mass percent - khanacademy.org
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