Question

The molarity of pure water is

• A. 55.6
• B. 50
• C. 100
• D. 18

Answer 1

The correct option is A 55.6

$\text{Molarity of pure water=55.6}$

$\text{At 25℃, density of water=1 gram/ml}$

$1g=1ml$

$So,1000g=1000ml$

$\text{Number of moles of water=}\frac{1000}{18}=55.55mol$

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