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posted by Bob Sunday, September 26, 2010 at 11:48pm.

How many molecules are in 2.6 grams of H2O?

There are 6.022 x 10^23 molecules in a mole. How many moles do you have of water in 2.6 g? 2.6/molar mass = moles.

(6.022×10^23)×(2.6)/18

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