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Calculate the number of molecules in a d...

Calculate the number of molecules in a drop of water weighing 0.05 g.

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The correct Answer is:
`1.672 xx 10^(21)` molecules
18.0 g of `H_(2)O` contain molecules `= 6.022 xx 10^(23)`
0.05 g of `H_(2)O` contain molecules `= (0.05)/(18.0)xx6.022xx10^(23)=1.672xx10^(21)` molecules.
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