Question

the density of a solution prepared by dissolving 120g of urea in 1000g of water is 1.15g/ml .The molarity of soltuion is:

1.78M

1.02 M

2.05 M

0.5 M

Answer 1

The answer is 2.05M..

Total no of moles= 120/60 = 2 moles

Mass/density = volume

(120+1000)/1.15g/ml = 973 ml

Volume = 0.973l

Molarity = 2/0.973= 2.05M

... I hope this will help u..