Question

calculate the molarity of water if density is 1000 kilogram per metre cube

Answer 1

1 litre of water = 1000 cm^3 = 1000 g

1000 kg/m^3 = 1g/cm^3

1000 g of water = 1000/18

= 55.56 M..
( 18 is molecular weight of water) ......

Answer 2

Hey !!

Molarity of water means number of moles of water in 1 litre of water.

1 L of water = 1000 cm³ = 1000 g        ( ∵ d = 1000 kg/m³ = 1 g/cm³ )

     1000 g of H₂O = $\frac{1000}{18} moles = 55.56$ moles

Here, Molarity = 55.56 M

GOOD LUCK !!