1.

Mass of the following "element" // "compound" is given in grams. Calculate it.s moles and number of "molecules"//"atoms" : 2 g water (H_(2)O)

Answer»

Solution :Number of MOLES of 2g `H_(2)O= ("MASS of WATER")/("molecular mass of water")`
`=(2)/(18)`
`=(1)/(9)` mole
Number of molecules in 2 g water `(H_(2)O) = "Number of moles of "H_(2)O xx "Avogadro number"`
`=(1)/(9)" mole" xx 6.023 xx 10^(23) "molecules"// "mole"`
`~~ 0.6692 xx 10^(23)` molecules
`~~ 6.692 xx 10^(22)` molecules


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