Some Basic Concepts Of Chemistry Question 317

Question: The number of water molecules in 1 litre of water is [EAMCET 1990]

Options:

A) 18

B) $ 18\times 1000 $

C) $ N _{A} $

D) $ 55.55,N _{A} $

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Answer:

Correct Answer: D

Solution:

$ d=\frac{M}{V} $ (d = density, M= mass, V =volume) Since d = 1 So, $ M=V $

18gm = 18ml 18ml = NA molecules (NA = avogadro’s no.) 1000ml $ =\frac{N _{A}}{18}\times 1000 $ = 55.555 NA.



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