1.

Calculate the mass of the following: 1//51xx10^(23) molecules of water

Answer»

Solution :`"MOLECULAR mass of "H_(2)O=18`
`"NUMBER of moles"=("Number of MOLECULES of water")/("Avogadro.s number")`
`=1.51xx10^(23)//6.023xx10^(23)`
`=1//4`
`="0.25 moles"`


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