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Question

Chemistry Question on Solutions

What is molarity of pure water?

A

18.36 M18.36\, M

B

1.16 M1.16 \,M

C

55.56 M55.56 \,M

D

5.56 M5.56\, M

Answer

55.56 M55.56 \,M

Explanation

Solution

Density of water = 1 g/cm3 and its molecular weight is 18. So, 1000 cm3 of water will weigh 1000 g of water.

Now, we know that molarity = Mass of water  Molecular weight =\frac{\text { Mass of water }}{\text { Molecular weight }} =100018=\frac{1000}{18} =55.56 M=55.56 \,M

Molarity= Mass of water  Molecular weight Molarity = \frac{\text { Mass of water }}{\text { Molecular weight }}

Molarity=100018Molarity = \frac{1000}{18}

Molarity=55.56MMolarity = 55.56 M

Hence, themolarityof water is 55.56 M.