The mass of a molecule of water is

The mass of a molecule of water is

A
$3 \times 10^{- 26} kg$
B
$3 \times 10^{- 25} kg$
C
$1.5 \times 10^{- 26} kg$
D
$2.5 \times 10^{- 26} kg$

Solution:

$6 \times 10^{23} molecules has mass = 18 gm$
$1 molecule has mass = \frac{18}{6 \times 10^{23}} = 3 \times 10^{- 23} gm$
$= 3 \times 10^{- 26} kg$

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