Question

The molarity of pure water is:

• A. 100
• B. 55.6
• C. 18
• D. 5.56

Answer 1

Answer: (B)

55.6

Answer 2

At 25°C, density of water = 1 g/ml

1 g = 1 ml

So, 1000 g = 1000 ml

Now, number of moles of water $=\frac{1000}{18}=55.55 \,mol$

Molarity of water $=\frac{55.6}{1 \,L }=55.55\, M$

Hence, themolarity**of pure water is 55.6 M. **