The weight of one molecules of water is approximately:

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3 \times 10^{- 23}

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18 \times 22.4

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3 \times 10^{23}

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Solution

The correct option is B $3 \times 10^{- 23}$
Weight of one mole of water = 18 g
The number of molecules in water = $\frac{18}{6.023 \times 10^{23}} = 3 \times 10^{- 23}$

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