Question

According to the mole concept in chemistry, what is the number of carbon atoms in 12 g of Carbon-12?

• A. \(6.022 \times 10^{23}\)
• B. \(6.022 \times 10^{-23}\)
• C. \(1.602 \times 10^{19}\)
• D. \(1.602 \times 10^{-19}\)

Hint:

Always remember: \[ 12 \text{ g Carbon-12} = 1 \text{ mole} \] and \[ 1 \text{ mole} = 6.022 \times 10^{23} \] particles, atoms, molecules, or ions.

Answer 1

The Correct Option is A

Concept: One mole is the amount containing Avogadro's number (N_A = 6.022×10²³) of entities, defined from exactly 12 g of Carbon-12.

Step 1: Apply the definition.
12 g of C-12 = 1 mole, so it contains exactly N_A atoms.

Step 2: Match to options.
6.022×10²³ matches; 10⁻²³ is wrong exponent; 1.602×10¹⁹ is unrelated; 1.602×10⁻¹⁹ is electron charge magnitude.

Final Answer: 6.022×10²³ (option A).