The mass of a molecule of water is

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(A) The molar mass of water $(H_2O)$ is $18 \ g/mol$.According to the mole concept,$1 \ mol$ of water contains $6.022 	imes 10^{23}$ molecules and ha

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$3 	imes 10^{-26} \ kg$

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(A) The molar mass of water $(H_2O)$ is $18 \ g/mol$.According to the mole concept,$1 \ mol$ of water contains $6.022 	imes 10^{23}$ molecules and has a mass of $18 \ g$.Mass of $1$ molecule of water $= \frac{18 \ g}{6.022 	imes 10^{23}} \approx 2.99 	imes 10^{-23} \ g$.Converting this to kilograms: $2.99 	imes 10^{-23} \ g 	imes \frac{1 \ kg}{1000 \ g} \approx 3 	imes 10^{-26} \ kg$.

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