A mole is a measure up of mass. For any type of substance , a mole is the molecular load of the substance, to express in grams. A water molecule consists of 2 hydrogen atoms and also one oxygen atom. Hydrogen has actually an atomic load of 1; and oxygen has actually an atomic weight of 16 (check the regular table because that the atom weights). So, one mole of water has actually a massive of 16 +1+1 = 18 grams.

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

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

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