How many molecules are present in 2.50 moles of H_2O?

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

Answer: (C)

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 approximately \$6.02 \times 10^{23}$ particles per mole.
2. Identify the given quantity: you have 2.50 moles of \(\mathrm{H_2O}\) molecules.
3. To find the total 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: \(\text{Number of molecules} = 2.50 \times 6.02 \times 10^{23}\)
5. Perform the multiplication of the numerical coefficients and keep the power of ten as is to find the total number of molecules in scientific notation.