How many hydrogen atoms are present in 6.02 × 10^{23} molecules of H_2O?

• A. 3.01 × 10^{23}
• B. 1.20 × 10^{24}
• C. 6.02 × 10^{23}
• D. 2.00 × 10^{24}

Answer: (B)

Verified step by step guidance

1. Identify the number of hydrogen atoms in one molecule of H_2O. Since each water molecule contains 2 hydrogen atoms, this is a key starting point.
2. Recognize that the problem gives the number of water molecules as 6.02 \times 10^{23}, which is Avogadro's number, representing one mole of molecules.
3. To find the total number of hydrogen atoms, multiply the number of water molecules by the number of hydrogen atoms per molecule: Total hydrogen atoms = (number of H_2O molecules) \times (2 hydrogen atoms per molecule).
4. Set up the multiplication as: Total hydrogen atoms = 6.02 \times 10^{23} \times 2.
5. Perform the multiplication of the coefficients and add the exponents of 10 accordingly to express the final answer in scientific notation.