Q21 / 160 · AP EAMCET 2024 (20 May Shift 2) · Chemistry

The mass $\%$ of urea solution is 6 . The total weight of the solution is 1000 g . What is its concentration in $\mathrm{mol} \mathrm{L}^{-1}$ ? (density of water $=1.0 \mathrm{~g} \mathrm{~mL}^{-1}$ ) $(C=12 u ; N=14 u ; O=16 u, H=1 u)$

  • A
    $1.5$
  • Correct answer
    B
    $1.064$
  • C
    $1.12$
  • D
    $0.80$

Solution

$\begin{aligned} & \text { Amount of urea }=60 \mathrm{~g} \\ & \text { Moles of urea }=\frac{60}{60}=1 \mathrm{~mole} \\ & \text { Molarity }=\frac{\text { Moles }}{\text { Volume of solution }} \\ & =\frac{1 \text { Mole }}{1 \text { Litre }}=1.0 \mathrm{M}\end{aligned}$

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

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