9.03*10^24 molecules of H2O?? calculate moles of H2O... then what is (9.03*10^24) in the question.. i mean what does it indicate or what it means.. basically what is it..???

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There are 6.02*10^23 Molecules in one mole of a substance (avogrados Number). Because of this you need to divide your total number of molecules (9.03*10^23) by Avog. Number.    9.03*10^23/6.02*10^23=Moles Of Substance