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Question

The mole fraction of I2 in benzene is 0.2 if the density of the solution is 1.2g/ml then calculate molality of the compound.

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Solution

Mole fraction of I is 0.2 , so , Benzene has 0.8. In 100 moles , 20 moles of I2 & 80 moles of benzene so in 1000g of solvent, we have 20×10006240 which is 3.2 molal (Mass of benzene =80×78=6240g)

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