How many molecules are present in 23 moles of oxygen (O_2)?

• A. 2.76 \times 10^{24} molecules
• B. 1.32 \times 10^{24} molecules
• C. 1.38 \times 10^{25} molecules
• D. 6.02 \times 10^{23} molecules

Answer: (C)

Verified step by step guidance

1. Recall that one mole of any substance contains Avogadro's number of entities (atoms, molecules, ions, etc.), which is approximately \$6.022 \times 10^{23}$ entities per mole.
2. Identify the quantity given: 23 moles of oxygen molecules (\(O_2\)). We want to find the total number of oxygen molecules in these 23 moles.
3. Use the formula to calculate the number of molecules: \(\text{Number of molecules} = \text{moles} \times \text{Avogadro's number}\).
4. Substitute the values into the formula: \(\text{Number of molecules} = 23 \times 6.022 \times 10^{23}\).
5. Multiply the numbers (23 and 6.022) and keep the power of ten the same to find the total number of molecules present in 23 moles of oxygen.