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JEE Main levelSingle correct optionDifficulty 2 of 3so006

A $2.00 M$ aqueous solution of urea (molar mass $60 g mo l^{- 1}$ ) has density $1.03 g m L^{- 1}$ . Its molality is closest to

A $2.20 m$
B $2.00 m$
C $2.27 m$
D $1.94 m$

Answer: A

Take

1 L

of solution: mass

= 1030 g

, urea

= 2 \times 60 = 120 g

, so water

= 910 g

. Molality

= 2.00/0.910 = 2.20 m

. Subtracting

120

from

1000

instead of

1030

gives the wrong value

2.27

.

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