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To teach you how to do this problem:

1. Look at the Periodic Table. O =16 grams/mole, H =1.01 grams/mole

2. Calculate the Molecular Weight of Water. 1*O + 2*H: 16+2.02=18.02g/mole

3. Divide the mass of what you have by the Molecular Weight: 35.1g H2O/(18.02 g H2O/mole H2O)

4. The units g H2O cancel leaving you with mole H2O.

5. 35.1 grams H2O= 1.95 moles H2O

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