Dissolving 120g of urea (mol wt = 60) in...

Dissolving `120g` of urea (mol wt `= 60)` in 1000g of water gave a solution of density 1.15 g/mL. The molarity of the solution is

A

1.78 M

B

2.00M

C

2.05 M

D

2.22M

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The correct Answer is:

C

Mole = `120/60 = 2`
mass of solution =1120g
`V = (1120)/(1.15xx1000)=112/115L`
` M = (2xx115)/112 = 2.05` mol/ litre

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