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Calculate the mass of compound (molar ma...

Calculate the mass of compound (molar mass = 256 g `mol^(-1)` ) to be dissolved in 75 g of benzene to lower its freezing point by 0.48 `K(K_(f) = 5.12 " K kg " mol^(-1))` .

Text Solution

Verified by Experts

Given : `Delta T_(f) = (K_(f) W_(2) xx 1000)/(W_(1) xx M_(2))`
0.48 K = 5.12 k Kg `mol^(-1) xx (W_(2))/(75 xx 256) xx 1000`
`W_(2) = (0.48 xx 75 xx 256)/(5.12 xx 1000)`
`W_(2) ` = 1.8 g
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