Answers

2016-08-04T20:10:04+08:00
H2O, or

1 atom of hydrogen and 2 atoms of oxygen.
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2016-08-04T20:10:29+08:00
Thus, water is essential for life. 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.
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