Multiple Choice
How is the atomic mass of bromine calculated given its isotopes, Br-79 with 51% abundance and Br-81 with 49% abundance?
2. Atoms & Elements
Atomic Mass
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which term represents the sum of the atomic masses of the atoms in a molecule?
A
Empirical Formula
B
Atomic Number
C
Avogadro's Number
D
Molar Mass
Verified step by step guidance1
To understand the term 'Molar Mass', we first need to know that it represents the mass of one mole of a substance, typically expressed in grams per mole (g/mol).
Molar Mass is calculated by summing the atomic masses of all the atoms present in a molecule. These atomic masses are usually found on the periodic table and are expressed in atomic mass units (amu).
For example, if you have a molecule of water (H₂O), you would add the atomic masses of two hydrogen atoms and one oxygen atom to find the molar mass.
The atomic mass of hydrogen is approximately 1.01 amu, and the atomic mass of oxygen is approximately 16.00 amu. Therefore, the molar mass of water would be calculated as: .
Understanding molar mass is crucial for converting between the mass of a substance and the amount in moles, which is a fundamental concept in stoichiometry and chemical reactions.
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