Water is a compound of hydrogen and oxygen when combined in the ratio of 1 : 8 by mass. Molar mass of water molecule is calculated as 18 g, then the mass of a molecule of water is

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$3 \times 10^{- 25} kg$

$2.5 \times 10^{- 23} kg$

$1.5 \times 10^{- 26} kg$

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

answer is A.

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Detailed Solution

Molar mass of $H_{2} O \to 18 \times 10^{- 3} Kg$
$\begin{array}{l} 6.023 \times 10^{23} H_{2} O \to 18 \times 10^{- 3} Kg \\ 1 \to ? \\ \frac{18 \times 10^{- 3}}{6.023 \times 10^{23}} \Rightarrow 2.98 \times 10^{- 3} \times 10^{- 23} \\ \Rightarrow 2.98 \times 10^{- 26} Kg \end{array}$

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