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  4. How many molecules are there in 10 drops water, if its volume is 0.05 ml per drop and density is 1 g per ml?

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Q. How many molecules are there in $10$ drops water, if its volume is $0.05\, ml$ per drop and density is $1\, g\, per\, ml$?

NTA AbhyasNTA Abhyas 2020Some Basic Concepts of Chemistry

Solution:

Weight $=$ volume $x$ density
$=0.05 \times 1=0.05\, g$
Number of molecules $=\frac{\text { weight }}{\text { molecular weight }}\times N _{ A }$
$=\frac{0.05}{18} \times 6.023 \times 10^{23}$
$=1.667 \times 10^{21}$ molecules