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Question

The molarity of pure water is:
55.5
18
5.56
100

A

5.56

B

100

C

55.5

D

18

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Solution

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Molarity is defined as the number of moles of the solute per litre of solution.

$M o l a r i t y = \frac{N o o f m o l e s o f s o l u t e}{V o l u m e o f s o l u t i o n i n l i t r e}$

We are given that the density of water is $1 g / m l$ . This is equal to $ 1 Kg/ L $.

Therefore, the mass of $1 L$ of water will be:

$= D e n s i t y o f w a t e r \times V o l u m e = 1 \frac{K g}{L} \times 1 L = 1 K g = 1000 g$

Therefore, number of moles in $1 K g$ of water $= \frac{m a s s}{m o l a r m a s s}$ $= \frac{1000}{18} = 55.56$

Therefore, molarity of water = $= \frac{55.56 m o l e s}{1 L} = 55.56 M$

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