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Question

The molarity of pure water is:
  1. 55.5
  2. 18
  3. 5.56
  4. 100

A
5.56
B
100
C
55.5
D
18
Solution
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Molarity is defined as the number of moles of the solute per litre of solution.

Molarity=No of moles of soluteVolume of solution in litre

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

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

= Density of water × Volume=1KgL×1L=1Kg=1000g

Therefore, number of moles in 1Kg of water =massmolarmass =100018=55.56

Therefore, molarity of water = =55.56moles1L=55.56 M

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