How many atoms are present in 5.80 moles of He?

• A. 1.04 × 10^{25} atoms
• B. 3.49 × 10^{24} atoms
• C. 6.02 × 10^{23} atoms
• D. 9.63 × 10^{22} atoms

Answer: (B)

Verified step by step guidance

1. Identify the quantity given: 5.80 moles of helium (He).
2. Recall that 1 mole of any substance contains Avogadro's number of particles (atoms, molecules, etc.), which is \$6.022 \times 10^{23}$ particles per mole.
3. Set up the calculation to find the total number of atoms by multiplying the number of moles by Avogadro's number: \(\text{Number of atoms} = 5.80 \text{ moles} \times 6.022 \times 10^{23} \text{ atoms/mole}\).
4. Perform the multiplication of the numerical values and keep track of the powers of ten separately to maintain accuracy.
5. Express the final answer in scientific notation to clearly represent the number of atoms present in 5.80 moles of helium.