`400g` of pure water is (density `=1g//ml` )

Molality of pure water if its density is 0.936gm//ml :

20 ml of pure acetic acid (density = 0.75 gm ml^(-1) ) is mixed with 50 gm of water (density = 1 gm ml^(-1) ) at a certain temperature. Calculate the molality of acetic acid in the final solution.

100 mL of a sample of hard water requires 25.1 mL of 0.02 N H_(2)SO_(4) for complete reaction, The hardness of water ( density 1g//mL) is:

How many electron(s) is/are present in 1.8 mL of water (density =1g/mL)?

Dissolving 120g of urea (mol wt 60) in 100 g of water gave solution of density 1.158g//mL . The molarity of the solution is