Multiple Choice
How many moles of iron are present in 3.15 × 10^{24} atoms of iron?
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2. Atoms & Elements
Mole Concept
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
How many moles of Pb are present in 4.71 × 10^{21} Pb atoms?
A
0.782 mol
B
0.0782 mol
C
7.82 mol
D
0.00782 mol
Verified step by step guidance1
Identify the given quantity: the number of Pb atoms is \$4.71 \times 10^{21}$ atoms.
Recall Avogadro's number, which is the number of atoms in one mole: \$6.022 \times 10^{23}$ atoms/mol.
Set up the conversion from atoms to moles using the relationship: \(\text{moles of Pb} = \frac{\text{number of Pb atoms}}{\text{Avogadro's number}}\).
Substitute the values into the formula: \(\text{moles of Pb} = \frac{4.71 \times 10^{21}}{6.022 \times 10^{23}}\).
Perform the division to find the number of moles of Pb (do not calculate the final value here, just set up the expression).
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