1. Determine the molecular formula of water:
* Water's molecular formula is H₂O.
2. Find the molar mass of water:
* Hydrogen (H) has a molar mass of 1.008 g/mol.
* Oxygen (O) has a molar mass of 15.999 g/mol.
* Molar mass of H₂O = (2 * 1.008 g/mol) + 15.999 g/mol = 18.015 g/mol
3. Calculate the mass of hydrogen in water:
* Mass of hydrogen in H₂O = (2 * 1.008 g/mol) = 2.016 g/mol
4. Calculate the percent composition of hydrogen:
* Percent composition of hydrogen = (mass of hydrogen / molar mass of water) * 100%
* Percent composition of hydrogen = (2.016 g/mol / 18.015 g/mol) * 100%
* Percent composition of hydrogen in water ≈ 11.19%
