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प्रश्न
Determine the number of molecules in a drop of water which weighs 0.09 g.
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उत्तर
18 g of water has number of molecules = 6.02 x 1023
∴ 0.09 g of water will have no. of molecules = `(6.02 xx 10^23)/18 xx 9/100`
= 3.01 x 1021 molecules
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