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 2 hydrogen atoms and also one oxygen atom. Hydrogen has actually an atomic weight of 1; and oxygen has an atomic weight of 16 (inspect the regular table for the atomic weights). So, one mole of water has actually a mass of 16 +1+1 = 18 grams.
So, if one mole has a mass of 18 grams, 25 grams would certainly have actually 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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