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HomeHomework HelpchemistryMolecular Mass Calculation

Molecular Mass Calculation

Calculating molecular mass involves determining the mass of a molecule based on the sum of the atomic masses of its constituent elements according to their subscripts in the empirical formula.

intermediate
2 hours
Chemistry
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Overview

Calculating molecular mass from empirical formulas is a fundamental skill in chemistry that allows students to understand the composition of compounds. By learning to identify empirical formulas and using atomic masses from the periodic table, students can accurately determine the molecular mass of ...

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Key Terms

Empirical Formula
The simplest whole-number ratio of elements in a compound.

Example: The empirical formula of hydrogen peroxide is HO.

Molecular Formula
The actual number of atoms of each element in a molecule.

Example: The molecular formula of hydrogen peroxide is H₂O₂.

Atomic Mass
The mass of an atom, typically measured in atomic mass units (amu).

Example: The atomic mass of carbon is approximately 12.01 amu.

Mole
A unit that measures the amount of substance, equal to 6.022 x 10²³ particles.

Example: One mole of water contains 6.022 x 10²³ water molecules.

Periodic Table
A table of the chemical elements arranged by atomic number.

Example: The periodic table helps find atomic masses of elements.

Molecular Weight
The sum of the atomic weights of all atoms in a molecule.

Example: The molecular weight of water (H₂O) is 18.02 g/mol.

Related Topics

Stoichiometry
The study of the quantitative relationships in chemical reactions.
intermediate
Chemical Reactions
Understanding how substances interact and transform during reactions.
intermediate
Molarity
The concentration of a solution expressed as moles of solute per liter of solution.
intermediate

Key Concepts

Empirical FormulaMolecular WeightAtomic MassCalculation Method