How many molecules are present in 2.50 moles of O_2?

• A. 6.02 × 10^{23} molecules
• B. 3.01 × 10^{24} molecules
• C. 1.51 × 10^{24} molecules
• D. 2.50 × 10^{23} molecules

Answer: (C)

Verified step by step guidance

1. Recall that one mole of any substance contains Avogadro's number of molecules, which is \$6.02 \times 10^{23}$ molecules per mole.
2. To find the number of molecules in 2.50 moles of \(O_2\), use the formula: \(\text{Number of molecules} = \text{moles} \times \text{Avogadro's number}\).
3. Substitute the given values into the formula: \(\text{Number of molecules} = 2.50 \times 6.02 \times 10^{23}\).
4. Multiply the numerical coefficients (2.50 and 6.02) and keep the power of ten as is to express the answer in scientific notation.
5. Express the final answer in the form \(a \times 10^{b}\) molecules, where \(a\) is the product of the coefficients and \(b\) is the exponent from Avogadro's number.