Long answer question I — task. Science State Board, Class 10.

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Calculate the number of water molecules present in one drop of water that weighs $0.18$ $g$ .

Given data:

Mass of one drop of water

$=$

$0.18$

$g$

Molecular mass of water

$=$

Solution:

$\text{No. of moles}$

$=$

Where,

X is

Y is

$=$

$mole$

$\text{No. of molecules}$

$=$

$\ (\text {x} )\ \cdot\ (\text {y} )$

Where,

x is

y is

$=$

$6.023\times10^{z}$

$molecules$

z is

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10. Long answer question I