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How many atoms of Mg, O, and H are present in 3 formula units of Mg(OH)_2?
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2. Atoms & Elements
Mole Concept
Multiple Choice
A pure silver ring contains 2.80 × 10^{22} silver atoms. How many moles of silver atoms does it contain?
A
0.0465 mol
B
0.168 mol
C
4.65 mol
D
1.68 × 10^{-2} mol
검증된 단계별 안내1
Identify the given quantity: the number of silver atoms in the ring, which is \(2.80 \times 10^{22}\) atoms.
Recall the definition of a mole: one mole contains Avogadro's number of particles, which is \(6.022 \times 10^{23}\) atoms/mol.
Set up the conversion from atoms to moles using the relationship: \(\text{moles} = \frac{\text{number of atoms}}{\text{Avogadro's number}}\).
Substitute the given values into the formula: \(\text{moles} = \frac{2.80 \times 10^{22}}{6.022 \times 10^{23}}\).
Perform the division to find the number of moles of silver atoms in the ring.
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