Scelta multipla
How many moles are present in 3.01 × 10^{22} atoms of magnesium (Mg)?
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2. Atoms & Elements
Mole Concept
Scelta multipla
Fill in the blank: A mole is defined as the number of carbon atoms in __________ g of pure C-12.
A
6.022
B
12
C
1
D
24
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Recall the definition of a mole: it is the amount of substance that contains exactly Avogadro's number of entities (atoms, molecules, etc.).
Avogadro's number is approximately \(6.022 \times 10^{23}\), which corresponds to the number of atoms in exactly 12 grams of pure carbon-12 (\(^{12}C\)).
Therefore, the mole is defined as the number of carbon atoms in 12 grams of pure carbon-12.
This means that 1 mole of carbon-12 atoms has a mass of exactly 12 grams and contains \(6.022 \times 10^{23}\) atoms.
So, the blank in the statement should be filled with the number 12.
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