How many molecules are present in 0.25 mole of O_2?

• A. 3.01 \times 10^{23} molecules
• B. 6.02 \times 10^{23} molecules
• C. 2.50 \times 10^{22} molecules
• D. 1.51 \times 10^{23} molecules

Answer: (D)

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 given quantity: you have 0.25 moles of \(O_2\) molecules.
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: \(\text{Number of molecules} = 0.25 \times 6.02 \times 10^{23}\).
5. Perform the multiplication to find the total number of \(O_2\) molecules present in 0.25 moles.