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Q.

Calculate mass of the final solution obtained on heating a solution comprising of0.5 moles of urea in 2000 g of H₂O to a temperature of 101°C if $K_{b (H_{2} O)}$ = 0.5 K kg/mole.

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a

1030 g

b

250 g

c

530 g

d

280 g

answer is B.

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Detailed Solution

Change in temperature,

$\begin{array}{l} Δ T_{b} = K_{b} m \\ \Rightarrow 1 = 0.5 \times \frac{0.5}{x} \times 1000 \\ x = 250 \end{array}$

Solution = 250 + 30 = 280 g

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Calculate mass of the final solution obtained on heating a solution comprising of0.5 moles of urea in 2000 g of H2O to a temperature of 101°C if KbH2O = 0.5 K kg/mole.