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# How Many Moles Are In 25.0 Grams Of Water ? How Many Moles Are In 25 Grams Of Water

A mole is a measure of mass. For any substance , a mole is the molecular weight of the substance, expressed in grams. A water molecule consists of two hydrogen atoms and one oxygen atom. Hydrogen has an atomic weight of 1; and oxygen has an atomic weight of 16 (check the periodic table for the atomic weights). So, one mole of water has a mass of 16 +1+1 = 18 grams.

So, if one mole has a mass of 18 grams, 25 grams would have a mass of 25 grams/ 18 grams per mole or 1.39 moles.

With this procedure, you should be able to answer the Lithium Oxide question..

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Joey R.

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