Q15 / 150 · MHT CET 2018 · Chemistry

The molarity of urea (molar mass $60 g m o l^{- 1}$ ) solution obtained by dissolving $15 g$ of urea in $500 c m^{3}$ of water is

A
$2 m o l d m^{- 3}$
Correct answer
B
$0.5 m o l d m^{- 3}$
C
$0.125 m o l d m^{- 3}$
D
$0.0005 m o l d m^{- 3}$

Solution

Urea molar mass

= 60 g / mol

molarity = \frac{15 \times 1000}{60 \times 500} = \frac{15}{6 \times 5} = \frac{1}{2}

= 0.5 mol {dm}^{- 3}

Hence, the correct answer is option: 'B'.

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