18g glucose and 6 g urea are dissolved in 1L of solution at 27°C, the osmotic pressure in atm of the solution will be

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1.9

2.9

3.9

4.9

answer is D.

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Detailed Solution

$π V = (n_{1} + n_{2}) RT π V = (\frac{w_{1}}{m_{1}} + \frac{w_{2}}{m_{2}}) RT \begin{array}{l} (π \times 1) = (\frac{18}{180} + \frac{6}{60}) \times (0.0821 \times 300) \\ π = 4.926 atm ≃ 4.9 \end{array}$

Therefore, the correct option is D 4.9

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