KVPY 2019 SA Exam Previous Papers

Question : 43 of 80

Marks: +1, -0

The number of moles of water present in a spherical water droplet of radius 1.0 cm is :
[Given: density of water in the droplet = 1.0 g cm

^{–3}

]

Solution:

Volume of water droplet =

4/3πr^3

4/3π(1)^3

Mass of water droplet =

4/3π

gram
Number of moles of water molecule =

[4/3π]1/18={2π}/ 27

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