Which of the following is NOT equal to 1.00 mol of carbon-12?

• A. 6.022 × 10^{23} atoms of carbon-12
• B. 12.00 grams of carbon-12
• C. 22.4 liters of carbon-12 gas at STP
• D. The amount of carbon-12 containing Avogadro's number of atoms

Answer: (C)

Verified step by step guidance

1. Understand the definition of a mole: 1 mole of any substance contains exactly \$6.022 \times 10^{23}$ entities (atoms, molecules, etc.), known as Avogadro's number.
2. Recognize that 1 mole of carbon-12 atoms corresponds to \$6.022 \times 10^{23}$ atoms of carbon-12, so this quantity is equal to 1 mole.
3. Recall that the molar mass of carbon-12 is exactly 12.00 grams per mole, so 12.00 grams of carbon-12 is also equal to 1 mole.
4. Note that the volume of a gas at STP (Standard Temperature and Pressure) is related to the number of moles by the molar volume of an ideal gas, which is 22.4 liters per mole, but this applies to gases like ideal diatomic molecules, not to carbon-12 atoms in elemental form.
5. Conclude that 22.4 liters of carbon-12 gas at STP is NOT equal to 1 mole of carbon-12 atoms because carbon-12 is not typically a gas at STP, and the volume does not directly correspond to 1 mole of carbon-12 atoms.