What is the total number of atoms in 0.120 mol of glucose, C6H12O6? (Avogadro constant = 6.02 × 10^23 mol^-1)
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Correct answer
C. 2.89 × 10^24
Principle or equation
One mole of any substance contains Avogadro's number of entities. For a molecule, the total number of atoms equals the number of atoms per molecule multiplied by the number of moles and Avogadro's constant.
Why this answer is correct
Glucose has 6 carbon + 12 hydrogen + 6 oxygen = 24 atoms per molecule. Total atoms = 0.120 mol × 24 atoms/molecule × 6.02 × 10^23 mol^-1 = 0.120 × 24 × 6.02 × 10^23 = 2.89 × 10^24 atoms.
Example
For 0.100 mol of CO2 (3 atoms per molecule), total atoms = 0.100 × 3 × 6.02 × 10^23 = 1.81 × 10^23.
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