Multiple Choice
If you have 33.6 L of neon gas at STP, how many moles of neon do you have?
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2. Atoms & Elements
Mole Concept
Multiple Choice
How many atoms are present in 12 grams (1 mole) of carbon-12?
A
1.00 × 10^{22} atoms
B
6.022 × 10^{23} atoms
C
12 × 10^{23} atoms
D
3.01 × 10^{23} atoms
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Verified step by step guidance1
Recognize that 12 grams of carbon-12 corresponds to exactly 1 mole of carbon atoms because the molar mass of carbon-12 is 12 g/mol.
Recall Avogadro's number, which is the number of atoms in one mole of any substance. Avogadro's number is \(6.022 \times 10^{23}\) atoms/mole.
Since you have 1 mole of carbon-12 atoms, the total number of atoms is equal to Avogadro's number multiplied by the number of moles.
Write the expression for the number of atoms: \(\text{Number of atoms} = 1 \text{ mole} \times 6.022 \times 10^{23} \text{ atoms/mole}\).
Conclude that the number of atoms in 12 grams of carbon-12 is \(6.022 \times 10^{23}\) atoms.
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