2 hydrogen = 2 g
1 Oxygen = 16 g
18 grams so you had 9 grams 9/18 = 1/2 is the proportion. This would be 1/2 of a mole of water.
or are you asking the proportion by mass of H to O
2/16 = 1/8
If i have 9 gram of H2O find its atomic mass and proportion
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