How many hydrogen atoms are in 100.00 grams of water (H₂O)? Hint: Use moles as an intermediary unit and keep in mind you need to find hydrogen atoms.

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To find the number of hydrogen atoms in 100.00 grams of water, first calculate the moles of water: 100.00 g / 18.015 g/mol = 5.55 moles of H2O. Each mole of water contains 2 moles of hydrogen atoms, so there are 11.10 moles of hydrogen atoms. Using Avogadro's number (6.022 × 10^23 atoms/mol), multiply 11.10 moles by 6.022 × 10^23 to get approximately 6.681 × 10^24 hydrogen atoms.

How Many Hydrogen Atoms Are in 100