What is the number of hydrogen atoms in a 18.016 gram sample of water? A)2.000 B)6.022 × 10²³ C)18.02 D)1.204 × 10²⁴

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Quizplus · Accepted Answer

The molecular weight of water (H2O) is approximately 18.016 grams per mole, meaning an 18.016 gram sample of water is essentially 1 mole of water. Since each water molecule contains 2 hydrogen atoms, 1 mole of water contains 2 moles of hydrogen atoms. Given Avogadro's number (6.022 × 10^23) is the number of particles in a mole, 2 moles of hydrogen atoms would be 2 × 6.022 × 10^23 = 1.204 × 10^24 hydrogen atoms.

What Is the Number of Hydrogen Atoms in a 18