Write about the compositions of water
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Water is made up of hydrogen ions (H+) linked to hydroxyl ions (OH-) to form H2O. The molecular formula for water is H2O. From this formula and the atomic weights for hydrogen and oxygen you can calculate that the molecular weight of water is approximately 18 grams.
Note: The atomic weight of hydrogen (H) is 1 gram and the atomic weight of oxygen (O) is 16 grams.
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