How many atoms are present in 1.5 moles of helium (He)?

• A. 3.01 × 10^{23} atoms
• B. 1.5 × 10^{24} atoms
• C. 6.02 × 10^{23} atoms
• D. 9.03 × 10^{23} atoms

Answer: (D)

Verified step by step guidance

1. Recall that 1 mole of any substance contains Avogadro's number of particles (atoms, molecules, etc.), which is approximately \$6.02 \times 10^{23}$ particles per mole.
2. Identify the quantity given in the problem: 1.5 moles of helium atoms.
3. To find the total number of atoms, multiply the number of moles by Avogadro's number using the formula: \(\text{Number of atoms} = \text{moles} \times 6.02 \times 10^{23}\).
4. Substitute the given values into the formula: \(\text{Number of atoms} = 1.5 \times 6.02 \times 10^{23}\).
5. Perform the multiplication to find the total number of helium atoms present in 1.5 moles.