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Where can you find the molar mass of aluminum for use in chemical calculations?
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2. Atoms & Elements
Calculating Molar Mass
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Which of the following best defines molar mass?
A
The mass of a single atom or molecule, expressed in atomic mass units (amu)
B
The volume occupied by one mole of a gas at standard temperature and pressure
C
The mass of one mole of a substance, expressed in grams per mole (g/mol)
D
The number of atoms in one mole of a substance
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Understand that molar mass is a physical property that relates the mass of a substance to the amount of substance in moles.
Recall that the atomic mass unit (amu) is used to express the mass of individual atoms or molecules, not moles of substance.
Recognize that the volume occupied by one mole of a gas at standard temperature and pressure (STP) is called molar volume, not molar mass.
Know that the number of atoms in one mole of a substance is given by Avogadro's number, which is a count, not a mass.
Therefore, molar mass is best defined as the mass of one mole of a substance, expressed in grams per mole (g/mol).
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