Multiple Choice
How many moles are present in 15 grams of lithium (Li)? (Atomic mass of Li = 6.94 g/mol)
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2. Atoms & Elements
Mole Concept
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Which statement best describes a mole in chemistry?
A
A mole is the number of protons in g of carbon.
B
A mole is the volume occupied by any gas at room temperature and pressure.
C
A mole is the amount of substance that contains elementary entities (Avogadro’s number).
D
A mole is the mass in grams of exactly one atom of an element.
Verified step by step guidance1
Understand that a mole is a fundamental concept in chemistry used to count particles such as atoms, molecules, or ions, similar to how a dozen counts 12 items.
Recall that Avogadro's number, which is approximately \$6.022 \times 10^{23}$, defines the number of elementary entities (atoms, molecules, ions, etc.) in one mole of a substance.
Recognize that the mole is not defined by mass alone, volume alone, or the number of protons, but by the number of particles it contains.
Note that the mass of one mole of a substance in grams is numerically equal to its atomic or molecular mass in atomic mass units (amu), but this is a consequence, not the definition, of a mole.
Conclude that the best description of a mole is: 'A mole is the amount of substance that contains \$6.022 \times 10^{23}$ elementary entities (Avogadro’s number)'.
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