How many molecules are present in 2.3 moles of oxygen (O_2)?

• A. 2.3 × 10^{23} molecules
• B. 1.38 × 10^{24} molecules
• C. 6.02 × 10^{23} molecules
• D. 3.80 × 10^{24} molecules

Answer: (B)

Verified step by step guidance

1. Recall that one mole of any substance contains Avogadro's number of particles (atoms, molecules, ions, etc.), which is \$6.02 \times 10^{23}$ particles per mole.
2. Identify the quantity given in the problem: 2.3 moles of oxygen molecules (\(O_2\)).
3. To find the number of molecules, multiply the number of moles by Avogadro's number using the formula: \(\text{Number of molecules} = \text{moles} \times 6.02 \times 10^{23}\).
4. Substitute the given values into the formula: \(\text{Number of molecules} = 2.3 \times 6.02 \times 10^{23}\).
5. Perform the multiplication of the numerical coefficients and keep the power of ten as is to find the total number of oxygen molecules.