The amount of urea to be dissolved in 500 ml of water (K =18.6 K mole^-1 in 100g solvent) to produce a depression of 0.186°C in freezing point is

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0.3g

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Solution

The correct option is C
3g

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The amount of urea to be dissolved in 500 ml of water (K =18.6 K mole^-1 in 100g solvent) to produce a depression of 0.186°C in freezing point is

500 m l

0.186 K

K_{f} = 1.86 K k g m o l^{- 1} ρ_{H_{2} O} = 1 g m L^{- 1}

500

(K_{f} = 1.86)

{0.186}^{o} C

The amount of Urea to be dissolved is 500cc of water ( $K_{f}$ =1.86) to produce a depression of ${0.186}^{\circ} C$ in the freezing point is

500 c c

(K_{f} = {1.86}^{\circ} C k g m o l^{- 1})

{0.186}^{\circ} C

60 g / m o l

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