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2g of a non electrolyte solute dissolved...

2g of a non electrolyte solute dissolved in 75g of benzene lowered the freezing point of benzene by `0.20` k. The freezing point depression constant of benzene is `5.12 K Kg mol ^(-1).` Find the molar mass of the solute.

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`W_(2) =2g, W_(1) =75g, Delta T _(f)=0.2 K, k _(f) =5.12 kg mol ^(-1) , M _(2)` = ?
`M _(2) = (K _(f) xx W _(2) xx 1000)/( Delta T_(f) xx W_(1)) = (5.12 xx 2 xx 1000)/( 0.2 xx 75) = 682.66 g mol ^(-1)`
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